Inorganic Components

feldspathic_rock_fragment_xp_BL_JS-600.jpg Unique Identification: Albite
Site name: Bear
Light type: Cross-Polarized Light
Magnification: 400x
Submitted by: Joe Smoot
Notes: low birefringence of elongate prisms in multiple domains
Image Tags: none
feldspathic_rock_fragment_BL_JS-600.jpg Unique Identification: Albite
Site name: Bear
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Joe Smoot
Notes: translucent, irregular outline with multiple prism shape domains internal
Image Tags: test
YELL2-FD2-9-106.7CM-AMPH-CP-63X-600.jpg Unique Identification: Amphibole
Site name: Yellowstone
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: Classic amphibole with green-to-brown pleochroism, moderate birefringence, low extinction angle
Image Tags: moderately-birefringent cleavage
PD08-1B-7L-1_35.5CM_PP_10X_AMPH-600.jpg Unique Identification: Amphibole
Site name: Petit du Fresnoy
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: none
Image Tags: none
Amphibole_7_GR-600.jpg Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Guy Rothwell
Notes: AE 326 100 + 150, amphibole broken crystals cleavage fragments pleochroic
Image Tags: none
Amphibole_1_GR-600.jpg Unique Identification: Amphibole
Site name: Southeast flank of Nicaragua Rise, Caribbean Sea (15 52.72 N, 74 36.47 W)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Rounded hornblende prism, pleochroic in greens, prismatic crystal-fragment
Image Tags: none
JH08-1A-2L-1_50CM_AMPH_PP_40X-600.jpg Unique Identification: Amphibole
Site name: Joseph Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
Amphibole_2_GR-600.jpg Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Rounded hornblende prism and crystal fragment, pleochroic in greens, prismatic crystal-fragment
Image Tags: none
Amphibole_5_GR-600.jpg Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Guy Rothwell
Notes: AE 326 100 + 150, amphibole broken crystals cleavage fragments pleochroic
Image Tags: none
amphglassrindpp-600.jpg Unique Identification: Amphibole
Site name: Fish Lake, Kenai Peninsula, Alaska
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Magmatic amphibole phenocryst with a quenched volcanic glass rind. Isotropic glass visible as an irregular transparent fringe along grain boundaries.
Image Tags: prismatic ferromagnesian amphibole colored mafic-mineral moderate-birefringence quenched-rind volcanic-glass
JH08-1A-2L-1_50CM_AMPH_40X_CP-600.jpg Unique Identification: Amphibole
Site name: Joseph Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
FD-92-2-6_90.1CM_PP_63X_BLUE_GREEN_AMPH-600.jpg Unique Identification: Amphibole
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: Blue-to-green amphibole, rounded and worn
Image Tags: blue-green
YELL2-FD2-9_106.7CM_PP_AMPH_63X-600.jpg Unique Identification: Amphibole
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: Classic amphibole with green-to-brown pleochroism, moderate birefringence, low extinction angle
Image Tags: greenish-brown good-cleavage
amphglassrindcp-600.jpg Unique Identification: Amphibole
Site name: Fish Lake, Kenai Peninsula, Alaska
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Magmatic amphibole phenocryst with a quenched volcanic glass rind. Isotropic glass is extinct in cross-polarized light but visible as optical distortion on the birefringent surface of the grain.
Image Tags: prismatic ferromagnesian amphibole colored mafic-mineral moderate-birefringence quenched-rind volcanic-glass
PD08-1B-7L-1_35.5CM_AMPH_10X_CP-600.jpg Unique Identification: Amphibole
Site name: Petit du Fresnoy
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: none
Image Tags: none
1A-8L-1_39cmspec17_amphib-600.jpg Unique Identification: Amphibole
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 3000.0
Submitted by: Mark Shapley
Notes: Prismatic amphibole; detrital
Image Tags: prismatic good-cleavage hexagonal hornblende SEM
Amphibole_6_GR-600.jpg Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Guy Rothwell
Notes: AE 326 100 + 150, amphibole broken crystals cleavage fragments pleochroic
Image Tags: none
Amphibole_8_GR-600.jpg Unique Identification: Amphibole
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Guy Rothwell
Notes: pleochroic in greens, amphibole broken crystals cleavage fragments pleochroic
Image Tags: none
Apatite_01_pp_AB-600.jpg Unique Identification: Apatite
Site name: Lake Malawi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: apatite, euhedral, diagenesis, from light colored lamina of varve
Image Tags: none
Apatite_1_MDS_pp-600.jpg Unique Identification: Apatite
Site name: Jones
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: occurrence in Mazama tephra, euhedral volcanic
Image Tags: none
Apatite_01_xp_AB-600.jpg Unique Identification: Apatite
Site name: Lake Malawi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: apatite, euhedral, diagenesis, from light colored lamina of varve
Image Tags: none
Apatite_1_MDS_cp-600.jpg Unique Identification: Apatite
Site name: Jones
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: occurrence in Mazama tephra, euhedral volcanic
Image Tags: none
Aragonite_1ppl-600.jpg Unique Identification: Aragonite
Site name: Black Sea (42 05.94 N, 29 36.82 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of aragonite needles, acicular needles
Image Tags: none
Tritiform_aragonite_1xp-600.jpg Unique Identification: Aragonite
Site name: Black Sea (43 00.29 N, 36 00.68 E)
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: tritiform
Image Tags: none
Urmia_20-4_91cm_pp_40x_arag-600.jpg Unique Identification: Aragonite
Site name: LacCore reference collection
Light type: Plane-Polarized Light
Magnification: 400X
Submitted by: Val Stanley
Notes: acicular habit
Image Tags: none
aragonite_cumulus_PL_JS-600.jpg Unique Identification: Aragonite
Site name: Pyramid
Light type: Plane-Polarized Light
Magnification: 400X
Submitted by: Joe Smoot
Notes: high relief, needles, broken diatoms
Image Tags: none
Tritiform_aragonite_2ppl-600.jpg Unique Identification: Aragonite
Site name: Black Sea (43 00.29 N, 36 00.68 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: High power view of tritiform aragonite grains, resembling grains of rice or wheat, tritiform
Image Tags: none
Tritiform_aragonite_1ppl-600.jpg Unique Identification: Aragonite
Site name: Black Sea (43 00.29 N, 36 00.68 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: High power view of tritiform aragonite grains, resembling grains of rice or wheat, tritiform
Image Tags: none
backerod_10x_pp_wb-600.jpg Unique Identification: Backer rod
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: contaminant
backerod_10x_cp_2-600.jpg Unique Identification: Backer rod
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: contaminant
backerod_10x_cp-600.jpg Unique Identification: Backer rod
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: contaminant
backerod_10x_pp_2-600.jpg Unique Identification: Backer rod
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: contaminant
JONES_A5_71.6cm_10x_cp-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
JONES_A5_64.1cm_40x_cp0001-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
JONES_A5_64.1cm_40x_pp0001-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
JONES_A5_71.6cm_63x_cp-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
JONES_A5_64.1cm_10x_cp-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
JONES_A5_71.6cm_40x_pp-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
JONES_A5_71.6cm_10x_pp-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
JONES_A5_71.6cm_63x_pp-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
JONES_A5_71.6cm_40x_cp-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
JONES_A5_64.1cm_10x_pp-600.jpg Unique Identification: Banded carbonate mud
Site name: Jones Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
MUB17-2C-5L-1_64cm_630baritecp_3-600.jpg Unique Identification: Barite
Site name: Mubwindi Swamp, Uganda
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Barite from a ferric tropical peatland. Ba-S compositions determined by EDX on numerous individual grains. Prismatic grains show low birefringence and moderate relief, variable terminations, and and were initially mistaken for apatite.
Image Tags: low-birefringence moderate-relief diagenetic prismatic
MUB17-2C-5L-1_64cm_630baritecp_2-600.jpg Unique Identification: Barite
Site name: Mubwindi Swamp, Uganda
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Barite from a ferric tropical peatland. Ba-S compositions determined by EDX on numerous individual grains. Prismatic grains show low birefringence and moderate relief, variable terminations, and and were initially mistaken for apatite.
Image Tags: low-birefringence moderate-relief diagenetic prismatic
MUB17-2C-5L-1_64cm_630baritepp_3-600.jpg Unique Identification: Barite
Site name: Mubwindi Swamp, Uganda
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Barite from a ferric tropical peatland. Ba-S compositions determined by EDX on numerous individual grains. Prismatic grains show low birefringence and moderate relief, variable terminations, and and were initially mistaken for apatite.
Image Tags: low-birefringence moderate-relief diagenetic prismatic
MUB17-2C-5L-1_64cm_630baritepp-600.jpg Unique Identification: Barite
Site name: Mubwindi Swamp, Uganda
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Barite from a ferric tropical peatland. Ba-S compositions determined by EDX on numerous individual grains. Prismatic grains show low birefringence and moderate relief, variable terminations, and and were initially mistaken for apatite.
Image Tags: low-birefringence moderate-relief diagenetic prismatic
MUB17-2C-5L-1_64cm_630baritecp-600.jpg Unique Identification: Barite
Site name: Mubwindi Swamp, Uganda
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Barite from a ferric tropical peatland. Ba-S compositions determined by EDX on numerous individual grains. Prismatic grains show low birefringence and moderate relief, variable terminations, and and were initially mistaken for apatite.
Image Tags: low-birefringence moderate-relief diagenetic prismatic
MUB17-2C-5L-1_64cm_630baritepp_2-600.jpg Unique Identification: Barite
Site name: Mubwindi Swamp, Uganda
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Barite from a ferric tropical peatland. Ba-S compositions determined by EDX on numerous individual grains. Prismatic grains show low birefringence and moderate relief, variable terminations, and and were initially mistaken for apatite.
Image Tags: low-birefringence moderate-relief diagenetic prismatic
Biotite_2ppl-600.jpg Unique Identification: Biotite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of brown and green mica flakes, pyroxene crystal fragments also in the field, pyroxenes crystal-fragment flakes
Image Tags: none
Biotite_01_pp_AB-600.jpg Unique Identification: Biotite
Site name: Lake Malawi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: biotite, volcanic
Image Tags: none
Biotite_3ppl-600.jpg Unique Identification: Biotite
Site name: Bengal Fan, Indian Ocean ( 8 00.42 N, 86 16.97 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of green and brown mica flakes, flakes
Image Tags: none
TAJ-KAR08-1B-1P-1_82cm_ppl_40x_Bt-600.jpg Unique Identification: Biotite
Site name: Ozera Karakul
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: vivid interference colors
Image Tags: none
RD08-1D-2L-1_92cm_pp_40x_Bt_pleo_halo-600.jpg Unique Identification: Biotite
Site name: Reid Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Pleochroic halo from zircon in biotite; discoloration resulting from alpha particle irradiation
Image Tags: none
Green_biotite-600.jpg Unique Identification: Biotite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Large green biotite mica flake, flakes
Image Tags: none
Biotite_01_xp_AB-600.jpg Unique Identification: Biotite
Site name: Lake Malawi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: biotite, volcanic
Image Tags: none
YELL92-FD-2-9_18.7CM_PP_40X_BT-600.jpg Unique Identification: Biotite
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: A thin book of biotite sheets, with torn edges
Image Tags: flaky brown
1A-8L-1_39cmspec5_phyllo-600.jpg Unique Identification: Biotite
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 7000.0
Submitted by: Mark Shapley
Notes: Biotite; composition by EDX. Note platey phyllosilicate structure; in a smear slide, biotite grains will typically be viewed perpendicular to the cleavage plane, making this structure difficult to see.
Image Tags: mica platey sheet good-cleavage SEM
biotite_pp_02-600.jpg Unique Identification: Biotite
Site name: Big Soda
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: calcite-inclusion,
Image Tags: none
biotite_xp_02-600.jpg Unique Identification: Biotite
Site name: Big Soda
Light type: Cross-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: calcite-inclusion,
Image Tags: none
biotite_pp_01-600.jpg Unique Identification: Biotite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: none
Image Tags: none
Biotite_1ppl1-600.jpg Unique Identification: Biotite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Large biotite mica flake, note the conspicuously large size of the flake compared with the associated material, flakes
Image Tags: none
Biotite_MR_BV_cp-600.jpg Unique Identification: Biotite
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: colored green platey heavy-mineral basal-section
Image Tags: none
Biotite_MR_BV_pp-600.jpg Unique Identification: Biotite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: colored green platey heavy-mineral basal-section
Image Tags: none
Biotite_4ppl-600.jpg Unique Identification: Biotite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Brown biotite mica flake, flakes
Image Tags: none
bubble01cp-600.jpg Unique Identification: Bubble
Site name: not specified
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
bubble02pp-600.jpg Unique Identification: Bubble
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
bubble01pp-600.jpg Unique Identification: Bubble
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
bubble02cp-600.jpg Unique Identification: Bubble
Site name: not specified
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
1001_q7_02_cp-600.jpg Unique Identification: Calcareous silt
Site name: Lake McCarrons
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: with pyrite
Image Tags: none
1001_q7_02_pp-600.jpg Unique Identification: Calcareous silt
Site name: Lake McCarrons
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Amy Myrbo
Notes: with pyrite
Image Tags: pyrite
Detrital_Calcite_MR_BV_pp-600.jpg Unique Identification: Calcite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: transparent high-birefringent rhombohedric detrital
Image Tags: none
TAHL_PC3_2_137_2_400X_xp-600.jpg Unique Identification: Calcite
Site name: Tahltan Lake, BC, Canada
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Triassic marine limestone
Image Tags: corroded resorbed detrital pitted
TAHL_PC3_2_137_2_400X_PP-600.jpg Unique Identification: Calcite
Site name: Tahltan Lake, BC, Canada
Light type: Plane-Polarized Light
Magnification: 400X
Submitted by: Mark Shapley
Notes: Triassic marine limestone
Image Tags: corroded resorbed detrital pitted
calcite_04_pp_BVG-600.jpg Unique Identification: Calcite
Site name: Miscanti
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Blas Valero
Notes: highly birefringent, high relief elongated, coating fragments (Chara?)
Image Tags: none
TAHL_PC3_4_85_5_400X_pp-600.jpg Unique Identification: Calcite
Site name: Tahltan Lake, BC, Canada
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Triassic marine limestone
Image Tags: subangular anhedral detrital extreme-birefringence
calcite_pp_01-600.jpg Unique Identification: Calcite
Site name: Tanners
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: coarse polycrystalline twinned shallow-water
Image Tags: none
TWTW-SLIDE1CP_01-600.jpg Unique Identification: Calcite
Site name: Twin
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: rhombic equant
Image Tags: none
calcite_01_cp_BVG-600.jpg Unique Identification: Calcite
Site name: Titicaca
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent high-birefringent rhombohedric endogenic
Image Tags: none
Calcite_02_pp_AB_tufa-600.jpg Unique Identification: Calcite
Site name: Itzan, Guatemala
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: limestone, calcite, detrital, glaciolacustrine
Image Tags: none
calcite_aggregate_MR_BV_CP-600.jpg Unique Identification: Calcite
Site name: Big Soda Lake
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: calcite aggregates, transparent high-birefringent
Image Tags: none
calcite_04_cp_BVG-600.jpg Unique Identification: Calcite
Site name: Miscanti
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Blas Valero
Notes: highly birefringent, high relief elongated, coating fragments (Chara?)
Image Tags: none
Calcite_01_xp_AB_limestone-600.jpg Unique Identification: Calcite
Site name: South Fraserdale, ON
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: limestone, calcite, detrital, glaciolacustrine
Image Tags: none
Calcite_01_pp_AB_limestone-600.jpg Unique Identification: Calcite
Site name: South Fraserdale, ON
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: limestone, calcite, detrital, glaciolacustrine
Image Tags: none
calcite_02_pp_BVG-600.jpg Unique Identification: Calcite
Site name: Titicaca
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Blas Valero
Notes: transparent high-birefringent rhombohedric endogenic
Image Tags: none
TWTW-SLIDE1PP_01-600.jpg Unique Identification: Calcite
Site name: Twin
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: rhombic equant
Image Tags: none
calcite_xp_02-600.jpg Unique Identification: Calcite
Site name: Twin
Light type: Cross-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: polycrystalline
Image Tags: none
calcite_01_pp_BVG-600.jpg Unique Identification: Calcite
Site name: Titicaca
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent high-birefringent rhombohedric endogenic
Image Tags: none
calcite_02_cp_BVG-600.jpg Unique Identification: Calcite
Site name: Titicaca
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Blas Valero
Notes: transparent high-birefringent rhombohedric endogenic
Image Tags: none
calcite_03_pp_BVG-600.jpg Unique Identification: Calcite
Site name: Negro Francisco
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Blas Valero
Notes: transparent high-birefringent rhombohedric endogenic, could be dolomite
Image Tags: none
calcite_aggregate_MR_BV_PP-600.jpg Unique Identification: Calcite
Site name: Big Soda Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: calcite aggregates, transparent high-birefringent
Image Tags: none
carbonate_rock_frag_BL_JS-600.jpg Unique Identification: Calcite
Site name: Bear
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Joe Smoot
Notes: multiple extinction domains with jagged boundaries, high birefringence
Image Tags: none
calcite_03_cp_BVG-600.jpg Unique Identification: Calcite
Site name: Negro Francisco
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Blas Valero
Notes: transparent high-birefringent rhombohedric endogenic, could be dolomite
Image Tags: none
calcite_pp_02-600.jpg Unique Identification: Calcite
Site name: Twin
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: polycrystalline
Image Tags: none
calcite_xp_01-600.jpg Unique Identification: Calcite
Site name: Tanners
Light type: Cross-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: coarse polycrystalline twinned shallow-water
Image Tags: none
Calcite_02_xp_AB_tufa-600.jpg Unique Identification: Calcite
Site name: Itzan, Guatemala
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: limestone, calcite, detrital, glaciolacustrine
Image Tags: none
Detrital_Calcite_MR_BV_cp-600.jpg Unique Identification: Calcite
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: transparent high-birefringent rhombohedric detrital
Image Tags: none
TAHL_PC3_4_85.5_400X_cp-600.jpg Unique Identification: Calcite
Site name: Tahltan Lake, BC, Canada
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Triassic marine limestone
Image Tags: subangular anhedral detrital extreme-birefringence
calcite_OL_JS-600.jpg Unique Identification: Calcite
Site name: Owens
Light type: Plane-Polarized Light
Magnification: 400X
Submitted by: Joe Smoot
Notes: dense translucent with bright internal grains, elongate with even width
Image Tags: none
Shuman_Bufflehead_22cm_40x_cp-600.jpg Unique Identification: Chlorite
Site name: Bufflehead Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: green
Shuman_Bufflehead_K_22cm_40x_pp-600.jpg Unique Identification: Chlorite
Site name: Bufflehead Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Note anomalous interference colors. Note pleochroic halo.
Image Tags: none
RD08-1D-1L-1_77.5cm_cp_10x_chl_anom-600.jpg Unique Identification: Chlorite
Site name: Reid Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: Note anomalous interference colors.
Image Tags: none
RD08-1D-1L-1_77.5cm_pp_10x_chl-600.jpg Unique Identification: Chlorite
Site name: Reid Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: none
Image Tags: flaky green
cigarette_ash_40x_cp-600.jpg Unique Identification: Cigarette Ash
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
cigarette_ash_10x_cp-600.jpg Unique Identification: Cigarette Ash
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
cigarette_ash_40x_pp-600.jpg Unique Identification: Cigarette Ash
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
cigarette_ash_10x_pp-600.jpg Unique Identification: Cigarette Ash
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
BH13_Superior_Clay_otherthings_40x_pp-600.jpg Unique Identification: Clay
Site name: Superior
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
BH13_Superior_Clay_otherthings_10x_cp-600.jpg Unique Identification: Clay
Site name: Superior
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
clay_matrix_2_JS-600.jpg Unique Identification: Clay
Site name: klin-2
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Joe Smoot
Notes: clay-rich mud with scattered silt grains and diatoms
Image Tags: none
BH13_Superior_Clay_otherthings_40x_cp-600.jpg Unique Identification: Clay
Site name: Superior
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
BH13_Superior_Clay_otherthings_10x_pp-600.jpg Unique Identification: Clay
Site name: Superior
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
clay_matrix_JS-600.jpg Unique Identification: Clay
Site name: klin-2
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Joe Smoot
Notes: clay-rich mud with scattered silt grains and diatoms (synedra?)
Image Tags: none
clay_matrix_2_xp_JS-600.jpg Unique Identification: Clay
Site name: klin-2
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Joe Smoot
Notes: clay-rich mud with scattered silt grains and diatoms
Image Tags: none
CARL-TWTW11-3D-5B-1-W_80.5cm_claycap_10x_pp-600.jpg Unique Identification: Clay turbidite cap
Site name: Twin Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
CARL-TWTW11-3D-5B-1-W_80.5cm_claycap_40x_pp-600.jpg Unique Identification: Clay turbidite cap
Site name: Twin Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
CARL-TWTW11-3D-5B-1-W_80.5cm_claycap_10x_cp-600.jpg Unique Identification: Clay turbidite cap
Site name: Twin Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
CARL-TWTW11-3D-5B-1-W_80.5cm_claycap_40x_cp-600.jpg Unique Identification: Clay turbidite cap
Site name: Twin Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
YELL2-FD2-9_106.7_cm_cpx-600.jpg Unique Identification: Clinopyroxene
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: none
Image Tags: medium-birefringent silicate pyroxene
YELL2-FD2-9_106.7_cm_xpl-600.jpg Unique Identification: Clinopyroxene
Site name: Yellowstone
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: none
Image Tags: weakly-pleochroic cleavage silicate pyroxene
HERD11_G1_64_9PP_200X_wb-600.jpg Unique Identification: Diatom ooze
Site name: Herd
Light type: Plane-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
HERD11_G1_64_9CP_200X-600.jpg Unique Identification: Diatom ooze
Site name: Herd
Light type: Cross-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
HERD11_G1_65_4PP_200X_wb-600.jpg Unique Identification: Diatom ooze
Site name: Herd
Light type: Plane-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
HERD11_G1_65_1PPnew_200X_wb-600.jpg Unique Identification: Diatom ooze
Site name: Herd
Light type: Plane-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
HERD11_G1_65_1CP_200X-600.jpg Unique Identification: Diatom ooze
Site name: Herd
Light type: Cross-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
HERD11_G1_65_4CP_200X-600.jpg Unique Identification: Diatom ooze
Site name: Herd
Light type: Cross-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
1001_q4_01_cp-600.jpg Unique Identification: Diatomaceous carbonate mud
Site name: Lake McCarrons
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: Highly birefringent, rhombic to ellipsoidal calcite up to 20 microns in dimension; isotropic diatom frustules are extinct in cross-polarized light.
Image Tags: rhombic
1001_q4_01_pp-600.jpg Unique Identification: Diatomaceous carbonate mud
Site name: Lake McCarrons
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: Diverse elongate diatom forms interspersed with rhombic to ellipsoidal, colorless calcite up to 20 microns in dimension.
Image Tags: rhombic
Red_LAke_peatland_detrdolo1-600.jpg Unique Identification: Dolomite
Site name: Red Lake Peatland
Light type: Scanning Electron Micrograph
Magnification: 1200.0
Submitted by: Mark Shapley
Notes: Detrital dolomite (composition confirmed by EDX) from beneath a peatland. The denticulate texture is interpreted as the result of partial dissolution in a low-pH depositional environment. Through the petrographic microscope, partially dissolved carbonate mineral grains may exhibit prominent 'zig-zag' patterning to birefringence, due to etching along cleavage planes and grain boundaries.
Image Tags: detrital toothed dissolution etched ragged reaction-texture SEM resorbed
Dolomite_01_MR_BV_CP-600.jpg Unique Identification: Dolomite
Site name: Bosumtwi
Light type: Cross-Polarized Light
Magnification: 630X
Submitted by: Michael Rosen Blas Valero
Notes: corroded rhombic transparent high-birefringent
Image Tags: none
Red_LAke_peatland_detrdolo4-600.jpg Unique Identification: Dolomite
Site name: Red Lake Peatland
Light type: Scanning Electron Micrograph
Magnification: 5000.0
Submitted by: Mark Shapley
Notes: Detrital dolomite (composition confirmed by EDX) from beneath a peatland. The denticulate texture is interpreted as the result of partial dissolution in a low-pH depositional environment. Through the petrographic microscope, partially dissolved carbonate mineral grains may exhibit prominent 'zig-zag' patterning to birefringence, due to etching along cleavage planes and grain boundaries.
Image Tags: detrital toothed dissolution etched ragged reaction-texture SEM resorbed
dolomite_cumulus_PL_JS-600.jpg Unique Identification: Dolomite
Site name: Pyramid
Light type: Plane-Polarized Light
Magnification: 400X
Submitted by: Joe Smoot
Notes: high relief, rhombic
Image Tags: none
Dolomite_01_MR_BV_PP-600.jpg Unique Identification: Dolomite
Site name: Bosumtwi
Light type: Plane-Polarized Light
Magnification: 630X
Submitted by: Michael Rosen Blas Valero
Notes: corroded rhombic transparent high-birefringent
Image Tags: none
Dolomite_MR_BV_CC-600.jpg Unique Identification: Dolomite
Site name: Bosumtwi
Light type: Cross-Polarized Light
Magnification: 630X
Submitted by: Michael Rosen Blas Valero
Notes: euhedral, rhombic transparent high-birefringent
Image Tags: none
Dolomite_MR_BV_PP-600.jpg Unique Identification: Dolomite
Site name: Bosumtwi
Light type: Plane-Polarized Light
Magnification: 630X
Submitted by: Michael Rosen Blas Valero
Notes: rhombic transparent high-birefringent
Image Tags: none
Red_LAke_peatland_detrdolo2-600.jpg Unique Identification: Dolomite
Site name: Red Lake Peatland
Light type: Scanning Electron Micrograph
Magnification: 1200.0
Submitted by: Mark Shapley
Notes: Detrital dolomite (composition confirmed by EDX) from beneath a peatland. The denticulate texture is interpreted as the result of partial dissolution in a low-pH depositional environment. Through the petrographic microscope, partially dissolved carbonate mineral grains may exhibit prominent 'zig-zag' patterning to birefringence, due to etching along cleavage planes and grain boundaries.
Image Tags: detrital toothed dissolution etched ragged reaction-texture SEM resorbed
Red_LAke_peatland_detrdolo5-600.jpg Unique Identification: Dolomite
Site name: Red Lake Peatland
Light type: Scanning Electron Micrograph
Magnification: 1800.0
Submitted by: Mark Shapley
Notes: Detrital dolomite (composition confirmed by EDX) from beneath a peatland. The denticulate texture is interpreted as the result of partial dissolution in a low-pH depositional environment. Through the petrographic microscope, partially dissolved carbonate mineral grains may exhibit prominent 'zig-zag' patterning to birefringence, due to etching along cleavage planes and grain boundaries.
Image Tags: detrital toothed dissolution etched ragged reaction-texture SEM resorbed
GLAD6-BOS04-5A-20H-2_10.7_cm_dolomite_pp-600.jpg Unique Identification: Dolomite
Site name: Lake Bosumtwi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Dolomite_1-600.jpg Unique Identification: Dolomite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Euhedral dolomite rhomb, rhombic
Image Tags: none
GLAD6-BOS04-5A-20H-2_10.7_cm_dolomite_cp-600.jpg Unique Identification: Dolomite
Site name: Lake Bosumtwi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Red_LAke_peatland_detrdolo3-600.jpg Unique Identification: Dolomite
Site name: Red Lake Peatland
Light type: Scanning Electron Micrograph
Magnification: 1500.0
Submitted by: Mark Shapley
Notes: Detrital dolomite (composition confirmed by EDX) from beneath a peatland. The denticulate texture is interpreted as the result of partial dissolution in a low-pH depositional environment. Through the petrographic microscope, partially dissolved carbonate mineral grains may exhibit prominent 'zig-zag' patterning to birefringence, due to etching along cleavage planes and grain boundaries.
Image Tags: detrital toothed dissolution etched ragged reaction-texture SEM resorbed
dolomite_cumulus_xp_PL_JS-600.jpg Unique Identification: Dolomite
Site name: Pyramid
Light type: Cross-Polarized Light
Magnification: 400X
Submitted by: Joe Smoot
Notes: high birefringence, rhombic
Image Tags: none
MHAFB11-1A-215Q-2_45cm_erionite_cement630cp-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho, ID
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Cement-forming erionite in cross-polarized light, encrusting a feldspar grain. Highly birefringent acicular bundles in upper right are an unidentified accessory mineral.
Image Tags: fibrous diagenetic acicular radial alteration zeolite
1A-183A-1_82cm_erionite2-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 1500.0
Submitted by: Mark Shapley
Notes: Radiating fibrous habit of erionite from altered mafic volcaniclastic rocks; apparent under petrographic scope only at high magnification. This zeolite-family mineral is recognized as an inhalation hazard.
Image Tags: SEM zeolite fibrous needle low_relief low_birefringence diagenetic radial volcanic_glass health_hazard alteration
1A-183A-1_82cm_erionite6-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 6000.0
Submitted by: Mark Shapley
Notes: Radiating fibrous habit of erionite from altered mafic volcaniclastic rocks; apparent under petrographic scope only at high magnification. This zeolite-family mineral is recognized as an inhalation hazard. Note brittle fracture of individual fibers.
Image Tags: SEM zeolite fibrous needle low_relief low_birefringence diagenetic radial volcanic_glass health_hazard alteration
1A-183A-1_82cm_erionite3-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 1500.0
Submitted by: Mark Shapley
Notes: Radiating fibrous habit of erionite from altered mafic volcaniclastic rocks; apparent under petrographic scope only at high magnification. This zeolite-family mineral is recognized as an inhalation hazard.
Image Tags: SEM zeolite fibrous needle low_relief low_birefringence diagenetic radial volcanic_glass health_hazard alteration
MHAFB11-1A-236Q-2_144cm_erionite_cement630pp-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho, ID
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Erionite cement nadhering to a quartz grain.
Image Tags: fibrous diagenetic acicular radial alteration zeolite
MHAFB11-1A-236Q-2_144cm_erionite_cement630cp-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho, ID
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Erionite cement nadhering to a quartz grain.
Image Tags: fibrous diagenetic acicular radial alteration zeolite
MHAFB11-1A-215Q-2_45cm_erionite_cement630pp-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho, ID
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: The zeolite erionite forming a cement on feldspar silt grain.
Image Tags: fibrous diagenetic acicular radial alteration zeolite
1A-183A-1_82cm_erionite5-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 7000.0
Submitted by: Mark Shapley
Notes: Radiating fibrous habit of erionite from altered mafic volcaniclastic rocks; apparent under petrographic scope only at high magnification. This zeolite-family mineral is recognized as an inhalation hazard. Note brittle fracture of individual fibers.
Image Tags: SEM zeolite fibrous needle low_relief low_birefringence diagenetic radial volcanic_glass health_hazard alteration
1A-183A-1_82cm_erionite1-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 2500.0
Submitted by: Mark Shapley
Notes: Radiating fibrous habit of erionite from altered mafic volcaniclastic rocks; apparent under petrographic scope only at high magnification. This zeolite-family mineral is recognized as an inhalation hazard.
Image Tags: SEM zeolite fibrous needle low_relief low_birefringence diagenetic radial volcanic_glass health_hazard alteration
MHAFB11-1A-183A-1_92cm_erionite630pp-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho, ID
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Very fine fibrous bundles of erionite, formed diagenetically in a weathering volcaniclastic sandstone derived from basalts of the Snake Rive Plain, Idaho. Erionite in this form represents a potential inhalation hazard.
Image Tags: fibrous diagenetic acicular radial alteration
1A-183A-1_82cm_erionite4-600.jpg Unique Identification: Erionite
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 2000.0
Submitted by: Mark Shapley
Notes: Radiating fibrous habit of erionite from altered mafic volcaniclastic rocks; apparent under petrographic scope only at high magnification. This zeolite-family mineral is recognized as an inhalation hazard.
Image Tags: SEM zeolite fibrous needle low_relief low_birefringence diagenetic radial volcanic_glass health_hazard alteration
Brine_shrimp_fecal_pellet-600.jpg Unique Identification: Fecal pellet
Site name: Great Salt Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Cohen
Notes: brine shrimp fecal pellet
Image Tags: none
fecal_pellet_PL_JS-600.jpg Unique Identification: Fecal pellet
Site name: Pyramid
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Joe Smoot
Notes: clay with aragonite needles, dark clots are brine shrimp fecal pellets
Image Tags: none
brine_shrimp_fecal_pellet_RL-600.jpg Unique Identification: Fecal pellet
Site name: Great Salt Lake
Light type: Reflected Light
Magnification: not specified
Submitted by: Andy Cohen
Notes: brine shrimp fecal pellet
Image Tags: none
twinned_fldsp_phenos_pp-600.jpg Unique Identification: Feldspar
Site name: Fish Lake, Kenai Peninsula, Alaska
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: Large mineral inclusions and quenched glassy rind (scaly surface texture) distinguish twinned feldspar phenocrysts derived from an unidentified crystal-rich tephra.
Image Tags: twinned inclusions quenched-rind tephra
feldspar_grain_BL_JS-600.jpg Unique Identification: Feldspar
Site name: Bear
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Joe Smoot
Notes: Feldspar grain near image center. Low birefringence, twinning lamellae
Image Tags: none
BHRS13-1B-2B-1_11_2cm_feld400cp-600.jpg Unique Identification: Feldspar
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Large magmatic feldspar showing prominent orthogonal cleavage. Birefringence exceeds that normally described for feldspars due to the large size of the grain.
Image Tags: tabular good-cleavage feldspar
twinned_fldsp_phenos_cp-600.jpg Unique Identification: Feldspar
Site name: Fish Lake, Kenai Peninsula, Alaska
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: Large mineral inclusions and quenched glassy rind (scaly surface texture) distinguish twinned feldspar phenocrysts derived from an unidentified crystal-rich tephra.
Image Tags: twinned inclusions quenched-rind tephra
MHAFB11-1A-144A-1-35cm_rounded_feld630pp-600.jpg Unique Identification: Feldspar
Site name: Paleolake Idaho, ID
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Very well-rounded silt-sized feldspar grain; aeolian?
Image Tags: cleavage rounded low-birefringence
Microcline_01_pp_AB-600.jpg Unique Identification: Feldspar
Site name: Reid Lake, ON
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: microcline, detrital, glaciolacustrine
Image Tags: none
BHRS13-1B-2B-1_11_2cm_feld400pp-600.jpg Unique Identification: Feldspar
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Large magmatic feldspar showing prominent orthogonal cleavage.
Image Tags: tabular good-cleavage feldspar
Microcline_01_xp_AB-600.jpg Unique Identification: Feldspar
Site name: Reid Lake, ON
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: microcline, detrital, glaciolacustrine
Image Tags: none
1A-273Q-3_faceted_feld_close-600.jpg Unique Identification: Feldspar
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 7000.0
Submitted by: Mark Shapley
Notes: Textural detail of the cleavage structure in an angular detrital feldspar grain from a volcaniclastic sandstone.
Image Tags: SEM cleavage tabular
Microcline_02_xp_AB-600.jpg Unique Identification: Feldspar
Site name: Reid Lake, ON
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: microcline, detrital, glaciolacustrine
Image Tags: none
twin_fldsp_inclusions_cp-600.jpg Unique Identification: Feldspar
Site name: Fish Lake, Kenai Peninsula, Alaska
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: Large mineral inclusions and quenched glassy rind (scaly surface texture) distinguish twinned feldspar phenocrysts derived from an unidentified crystal-rich tephra.
Image Tags: twinned inclusions quenched-rind tephra
twin_fldsp_inclusions_pp-600.jpg Unique Identification: Feldspar
Site name: Fish Lake, Kenai Peninsula, Alaska
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: Large mineral inclusions and quenched glassy rind (scaly surface texture) distinguish twinned feldspar phenocrysts derived from an unidentified crystal-rich tephra.
Image Tags: twinned inclusions quenched-rind tephra
Zoned_feldspar_1-600.jpg Unique Identification: Feldspar
Site name: Tyrrhenian Sea, Mediterranean Sea
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Euhedral feldspar crystal showing oscillatory zoning, crystal surrounded by a thin envelope of glass, showing pyroclastic origin. Volcanic glass also in the field., oscillatory-twinning pyroclastic volcanic-glass
Image Tags: none
1A-273Q-3_58cm_faceted_feld-600.jpg Unique Identification: Feldspar
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 1500.0
Submitted by: Mark Shapley
Notes: Angular detrital feldspar grain with prominent cleavage from a volcaniclastic sandstone.
Image Tags: SEM cleavage tabular
feldspar_grain_xp_BL_JS-600.jpg Unique Identification: Feldspar
Site name: Bear
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Joe Smoot
Notes: Feldspar grain near image center; matrix of high relief aragonite needles of consistent size
Image Tags: none
Microcline_02_pp_AB-600.jpg Unique Identification: Feldspar
Site name: Reid Lake, ON
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: microcline, detrital, glaciolacustrine
Image Tags: none
MHAFB11-1A-144A-1-35cm_rounded_feld630cp-600.jpg Unique Identification: Feldspar
Site name: Paleolake Idaho, ID
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Very well-rounded silt-sized feldspar grain; aeolian?
Image Tags: cleavage rounded low-birefringence
Fiber-02_JB-600.jpg Unique Identification: Fiber
Site name: Peten Itza
Light type: not specified
Magnification: 100.0
Submitted by: Jordon Bright
Notes: none
Image Tags: red thread-like
chiro-026-IRW.jpg-600.jpg Unique Identification: Fiber
Site name: Berendon Pond
Light type: not specified
Magnification: 400x
Submitted by: Ian Walker
Notes: none
Image Tags: fiberous string blue
RD08-1D-2L-1_92cm_40x_cp_contaminant-600.jpg Unique Identification: Fiber
Site name: Reid Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
floral_foam_40x_cp1-600.jpg Unique Identification: Floral Foam
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
floral_foam_40x_pp-600.jpg Unique Identification: Floral Foam
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
floral_foam_10x_pp-600.jpg Unique Identification: Floral Foam
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
floral_foam_10x_cp-600.jpg Unique Identification: Floral Foam
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
RD08-1D-2L-1_37.5cm_pp_63x_rounded_Gt-600.jpg Unique Identification: Garnet
Site name: Reid Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: isotropic, note rounded hexagonal profile
Image Tags: rounded
SILV_Gnt-600.jpg Unique Identification: Garnet
Site name: Lake Van
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: hexagonal
GNP-SWF10-3D-8L-1-W_33.8cm_glacvarv_depresslight_63x_pp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_34.5cm_glacvarv_raiseddark_10x_cp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_34.5cm_glacvarv_raiseddark_40x_cp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_34.5cm_glacvarv_raiseddark_63x_cp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_33.8cm_glacvarv_depresslight_10x_pp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_33.8cm_glacvarv_depresslight_40x_cp0001-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_34.5cm_glacvarv_raiseddark_10x_pp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_33.8cm_glacvarv_depresslight_40x_pp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_34.5cm_glacvarv_raiseddark_63x_pp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_34.5cm_glacvarv_raiseddark_40x_pp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_33.8cm_glacvarv_depresslight_10x_cp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-8L-1-W_33.8cm_glacvarv_depresslight_63x_cp-600.jpg Unique Identification: Glacial varves
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
glauconite_grain_OL_JS-600.jpg Unique Identification: Glauconite
Site name: Owens
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Joe Smoot
Notes: dark green nonpleochroic
Image Tags: none
Glauconite_3-600.jpg Unique Identification: Glauconite
Site name: Lower continental rise, west of Cape Agulhas, South Africa (35 03.97 S, 15 26.91 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Irregular and smooth glauconite grains, aggregate
Image Tags: none
Glauconite_1-600.jpg Unique Identification: Glauconite
Site name: Feni Drift, Rockall Trough, NE Atlantic (53 13.46 N, 18 53.69 W)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Glauconite grains - picked fraction, aggregate
Image Tags: none
Glauconite_2-600.jpg Unique Identification: Glauconite
Site name: Lower continental rise, west of Cape Agulhas, South Africa (35 03.97 S, 15 26.91 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Irregular and smooth glauconite grains, aggregate
Image Tags: none
Glauconite_1_GR-600.jpg Unique Identification: Glauconite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Guy Rothwell
Notes: SIOCLMR 173 G,
Image Tags: none
Gypsum_01_xp_AB-600.jpg Unique Identification: Gypsum
Site name: Great Salt Lake, UT
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: gypsum, authigenic
Image Tags: none
gypsum_2_MR_BV_CP-600.jpg Unique Identification: Gypsum
Site name: Peten Itza
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Michael Rosen Blas Valero
Notes: transparent low-birefringent monoclinic euhedral
Image Tags: none
CHI-HL06-1B-2U-2_gypsum2_xp-600.jpg Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Gypsum_01_pp_AB-600.jpg Unique Identification: Gypsum
Site name: Great Salt Lake, UT
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: gypsum, authigenic
Image Tags: none
gypsum_01_pp_BVG-600.jpg Unique Identification: Gypsum
Site name: Miscanti
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Blas Valero
Notes: transparent low-birefringent monoclinic euhedral corroded
Image Tags: none
CHI-HL06-1B-2U-2_gypsum3_pp-600.jpg Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
CHI-HL06-1B-2U-2_gypsum1_pp-600.jpg Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: rutilated
Gypsum_3_MR_BV_PP-600.jpg Unique Identification: Gypsum
Site name: Atacama
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Michael Rosen Blas Valero
Notes: transparent, carbonate inclusions, euhedral
Image Tags: none
Gypsum_02_pp_AB_detrital-600.jpg Unique Identification: Gypsum
Site name: Miscanti
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: none
Image Tags: none
Gypsum_3_MR_BV_CP-600.jpg Unique Identification: Gypsum
Site name: Atacama
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Michael Rosen Blas Valero
Notes: transparent, carbonate inclusions, euhedral
Image Tags: none
CHI-HL06-1B-2U-2_gypsum3_xp-600.jpg Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
gypsum_01_cp_BVG-600.jpg Unique Identification: Gypsum
Site name: Miscanti
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Blas Valero
Notes: transparent low-birefringent monoclinic euhedral corroded
Image Tags: none
CHI-HL06-1B-2U-2_gypsum2_pp-600.jpg Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
gypsum_MR_BV_CP-600.jpg Unique Identification: Gypsum
Site name: Peten Itza
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: carbonate inclusions, transparent low-birefringent monoclinic euhedral
Image Tags: none
Gypsum_02_xp_AB_detrital-600.jpg Unique Identification: Gypsum
Site name: Miscanti
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: none
Image Tags: none
gypsum_2_MR_BV_PP-600.jpg Unique Identification: Gypsum
Site name: Peten Itza
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Michael Rosen Blas Valero
Notes: transparent low-birefringent monoclinic euhedral
Image Tags: none
gypsum_MR_BV_PP-600.jpg Unique Identification: Gypsum
Site name: Peten Itza
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: carbonate inclusions, transparent low-birefringent monoclinic euhedral
Image Tags: none
CHI-HL06-1B-2U-2_gypsum1_xp-600.jpg Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
human_hair_40x_pp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
dog_hair_10x_pp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
dog_hair_10x_cp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
cat_hair_10x_cp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
dog_hair_40x_cp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
human_hair_40x_cp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
dog_hair_40x_pp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
cat_hair_40x_pp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
cat_hair_10x_pp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
cat_hair_40x_cp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
human_hair_10x_pp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
human_hair_10x_cp-600.jpg Unique Identification: Hair
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
BHRS13-1B-2B-1_11_2cm_microlytes_in_feld400pp-600.jpg Unique Identification: Inclusion
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Fine acicular inclusions in a twinned tabular feldspar(?)
Image Tags: inclusions acicular feldspar twinned
TAJ-KAR08-2A-1P-1_24cm_xpl_40x_inclusions-600.jpg Unique Identification: Inclusion
Site name: Ozera Karakul
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
BHRS13-1B-2B-1_11_2cm_microlytes_in_feld400cp-600.jpg Unique Identification: Inclusion
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Fine acicular inclusions in a twinned tabular feldspar(?)
Image Tags: inclusions acicular feldspar twinned
PD08-1B-7L-1_3.5CM_10X_CP_LITHIC-600.jpg Unique Identification: Inclusion
Site name: Petit du Fresnoy
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: detrital
Image Tags: lithic
HECI-URSW10-2-73cm_b-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Urswick Tarn
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: Hematite red brown transparent translucent opaque isotropic oxide heavy-mineral
TAS-MACK11-1A-2B-1_5.5cm_hematite_cp-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Lake Mackenzie
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: Hematite red brown transparent translucent opaque isotropic oxide heavy-mineral
clay_matrix_with_calcite_needles_2_JS-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: R.K.
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Joe Smoot
Notes: vermiform texture in matrix with many needle-like clear forms
Image Tags: none
iron_oxides_pp_BVG-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Tasmania
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: orange brown altered
Image Tags: none
calcite_ironoxide_40x_cp-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: LacCore reference collection
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
5A-1G-1_10cm_hemacoatcp630-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Medicine Lake, MT
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Patchy hematite precipitation on a rounded feldspar sand grain. Strong reddish-brown color obscures birefringence. Fine carbonate grains also adhere to the grain surface.
Image Tags: amorphous red colored oxide
clay_matrix_with_calcite_needles_2_xp_JS-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: R.K.
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Joe Smoot
Notes: matrix shows low birefringence, needles have high birefringent margins
Image Tags: none
ironoxide_40x_pp-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: LacCore reference collection
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
TAS-MACK11-1A-2B-1_5.5cm_hematite_pp-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Lake Mackenzie
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: Hematite red brown transparent translucent opaque isotropic oxide heavy-mineral
iron_oxides_cp_BVG-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Tasmania
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: orange brown altered
Image Tags: none
calcite_ironoxide_40x_pp-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: LacCore reference collection
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: iron oxides replacing rim of calcite grain
Image Tags: pseudomorphing
HECI-URSW10-2-73cm_a-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Urswick Tarn
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: Hematite red brown transparent translucent opaque isotropic oxide heavy-mineral
5A-1G-1_10cm_hemacoatpp630-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Medicine Lake, MT
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Patchy hematite precipitation on a rounded feldspar sand grain. Fine carbonate grains also adhere to the grain surface.
Image Tags: amorphous red colored oxide
GLAD7-MAL05-1B-9E-1_76.1irongoopyr-600.jpg Unique Identification: Iron (Hydr)oxides, Non-opaque (Hematite/Limonite)
Site name: Malawi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: AM
Notes: none
Image Tags: none
PRES-MTN12-12B-3L-1_4x_ppl_49cm_sand-600.jpg Unique Identification: Iron Oxides, Opaque (e.g., magnetite)
Site name: Mountain Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Magnetite in a well-rounded sand layer from Mountain Lake (San Francisco, California).
Image Tags: heavy-mineral rounded opaque-oxide magnetite
PRES-MTN12-12B-3L-1_ppl_4x_53cm_sandy-600.jpg Unique Identification: Iron Oxides, Opaque (e.g., magnetite)
Site name: Mountain Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Magnetite in a well-rounded sand layer from Mountain Lake (San Francisco, California).
Image Tags: heavy-mineral rounded opaque-oxide magnetite
calcite_ironoxide_40x_opaque_pp-600.jpg Unique Identification: Iron Oxides, Opaque (e.g., magnetite)
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: iron oxides replacing rim of calcite grain
Image Tags: pseudomorphing
PRES-MTN12-12B-3L-1_4x_xpl_49cm-600.jpg Unique Identification: Iron Oxides, Opaque (e.g., magnetite)
Site name: Mountain Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Magnetite in a well-rounded sand layer from Mountain Lake (San Francisco, California).
Image Tags: heavy-mineral rounded opaque-oxide magnetite
calcite_ironoxide_40x_opaque_cp-600.jpg Unique Identification: Iron Oxides, Opaque (e.g., magnetite)
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: iron oxides replacing rim of calcite grain
Image Tags: pseudomorphing
PRES-MTN12-12B-3L-1_xpl_4x_53cm_sandy-600.jpg Unique Identification: Iron Oxides, Opaque (e.g., magnetite)
Site name: Mountain Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Magnetite in a well-rounded sand layer from Mountain Lake (San Francisco, California).
Image Tags: heavy-mineral rounded opaque-oxide magnetite
kimwipe-xp-600.jpg Unique Identification: Kimwipe
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
kimwipe-pp0001-600.jpg Unique Identification: Kimwipe
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
kimwipe-xp0002-600.jpg Unique Identification: Kimwipe
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
kimwipe-pp-600.jpg Unique Identification: Kimwipe
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
labdust_calcite_40x_cp-600.jpg Unique Identification: Lab Dust
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
labdust_fibers_10x_pp-600.jpg Unique Identification: Lab Dust
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
labdust_fibers_10x_cp-600.jpg Unique Identification: Lab Dust
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
labdust_calcite_40x_pp-600.jpg Unique Identification: Lab Dust
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
WOW07_1B1K10_100PP_200X_wb-600.jpg Unique Identification: Laminated sulfidic silt
Site name: Wallowa
Light type: Plane-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: Iron-bearing silicate minerals derived from igneous rocks (flaky biotite upper left and lower right; prismatic pyroxenes top center and bottom near scale bar) are potential sources of reactive Fe contributing to iron sulfide formation in this sediment.
Image Tags: none
WOW07_1B1K10_100PP_100X_wb-600.jpg Unique Identification: Laminated sulfidic silt
Site name: Wallowa
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: Siliciclastic medium silt and diatom frustules with abundant, fine-grained opaque minerals. This sediment reacted dramatically within an hour or two of core splitting, as reactive Fe sulfides oxidized in contact with air.
Image Tags: none
WOW07_1B1K10_100PP_400X_wb-600.jpg Unique Identification: Laminated sulfidic silt
Site name: Wallowa
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Alteration of volcanic glass (irregular grains with conchoidal fracture, center and lower right, nearly isotropic in cross-polarized light below) provide another potential source of Fe for the formation of reactive iron sulfides.
Image Tags: none
WOW07_1B1K10_100CP_200X-600.jpg Unique Identification: Laminated sulfidic silt
Site name: Wallowa
Light type: Cross-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: Birefringent pyroxene grain in upper middle of image is in extinction orientation; pyroxene near scale bar shows moderate birefringence. Axial view of biotite flake (upper left) shows minimal birefringence.
Image Tags: none
WOW07_1B1K10_100CP_100X-600.jpg Unique Identification: Laminated sulfidic silt
Site name: Wallowa
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: Medium siliciclastic (quartz + feldspars) angular silt; isotropic diatoms and opaque iron sulfides are invisible in cross-polarized light.
Image Tags: none
WOW07_1B1K10_100CP_400X-600.jpg Unique Identification: Laminated sulfidic silt
Site name: Wallowa
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PD08-1B-7L-1_3.5CM_10X_PP_LITHIC_FRAG-600.jpg Unique Identification: Lithic fragment
Site name: Petit du Fresnoy
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: detrital; aggregate of other minerals
Image Tags: lithic
PD08-1B-7L-1_3.5CM_CP_10X_LITHIC_FRAG-600.jpg Unique Identification: Lithic fragment
Site name: Petit du Fresnoy
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: detrital; aggregate of other minerals
Image Tags: lithic
Magadiite_01_pp_AB-600.jpg Unique Identification: Magadiite
Site name: Kitagata Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: magadiite, hematite, identified by Jim Russell
Image Tags: hematite
Magadiite_01_xp_AB-600.jpg Unique Identification: Magadiite
Site name: Kitagata Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: magadiite, hematite, identified by Jim Russell
Image Tags: hematite
MOMOS-WOO06-5A-1K-5_140_plag_xpl_63x-600.jpg Unique Identification: Microcline
Site name: Lake of the Woods
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Val Stanley
Notes: Note diagnostic twinning pattern.
Image Tags: cross-hatched-twinning tartanplaid
EYASI_microcline_cp-600.jpg Unique Identification: Microcline
Site name: Lake Eyasi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
MOMOS-WOO06-5A-1K-5_140_plag_ppl_63x-600.jpg Unique Identification: Microcline
Site name: Lake of the Woods
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Val Stanley
Notes: 90 degree cleavages
Image Tags: transparent
EYASI_microcline_pp-600.jpg Unique Identification: Microcline
Site name: Lake Eyasi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
EYASI_microcline_polysynth-600.jpg Unique Identification: Microcline
Site name: Lake Eyasi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
mold_10x_cp-600.jpg Unique Identification: Mold
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
mold_10x_pp-600.jpg Unique Identification: Mold
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
mold_40x_pp-600.jpg Unique Identification: Mold
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
mold_40x_cp-600.jpg Unique Identification: Mold
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GLAD7-MAL05-1B-9E-1_84.9muscovitecp0001-600.jpg Unique Identification: Muscovite
Site name: Malawi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: AM
Notes: none
Image Tags: none
muscovite_03_pp_BVG-600.jpg Unique Identification: Muscovite
Site name: Malawi
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent flaky low birefringent
Image Tags: none
muscovite_01_cp_BVG-600.jpg Unique Identification: Muscovite
Site name: Malawi
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent flaky low birefringent
Image Tags: none
GLAD7-MAL05-1B-9E-1_84.9muscovitecp-600.jpg Unique Identification: Muscovite
Site name: Malawi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: AM
Notes: none
Image Tags: none
muscovite_pp_02_BVG-600.jpg Unique Identification: Muscovite
Site name: Malawi
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent flaky low birefringent
Image Tags: none
muscovite_01_pp_BVG-600.jpg Unique Identification: Muscovite
Site name: Malawi
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent flaky low birefringent
Image Tags: none
GLAD7-MAL05-1B-9E-1_84.9muscovitepp-600.jpg Unique Identification: Muscovite
Site name: Malawi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: AM
Notes: none
Image Tags: none
muscovite_cp_02_BVG-600.jpg Unique Identification: Muscovite
Site name: Malawi
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent flaky low birefringent
Image Tags: none
muscovite_03_cp_BVG-600.jpg Unique Identification: Muscovite
Site name: Malawi
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent flaky low birefringent
Image Tags: none
MOMOS-WOO06-5A-1K-5_141_Ol_ppx_40x-600.jpg Unique Identification: Olivine
Site name: Lake of the Woods
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Val Stanley
Notes: none
Image Tags: conchoidal-fracture green
BHRS13-1B-2B-1_11_2cm_olivine400cp-600.jpg Unique Identification: Olivine
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Olivine phenocryst from a basaltic tephra originating in the Snake River Plain, Idaho. Note high relief and conchoidal fracture. Minimum aeolian transport of 125 km is implied for this sand-sized, high-density grain.
Image Tags: mafic-mineral high-relief high-birefringence conchoidal-fracture
olivine02AMxp-600.jpg Unique Identification: Olivine
Site name: Lake of the Woods
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Amy Myrbo
Notes: Olivine
Image Tags: none
MOMOS-WOO06-5A-1K-3_132_Ol_ppx_40x-600.jpg Unique Identification: Olivine
Site name: Lake of the Woods
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Val Stanley
Notes: none
Image Tags: conchoidal-fracture green
olivine01AM-600.jpg Unique Identification: Olivine
Site name: Lake of the Woods
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Amy Myrbo
Notes: Olivine
Image Tags: none
TAJ-KAR08-1B-1P-1_82cm_40x_ppl_green-600.jpg Unique Identification: Olivine
Site name: Ozera Karakul
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: green
TAJ-KAR08-1B-1P-1_82cm_xpl_40x_green_pleo-600.jpg Unique Identification: Olivine
Site name: Ozera Karakul
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: conchoidal fracture, green, high relief
Image Tags: conchoidal-fracture
BHRS13-1B-2B-1_11_2cm_olivine400pp-600.jpg Unique Identification: Olivine
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Olivine phenocryst from a basaltic tephra originating in the Snake River Plain, Idaho. Moderate but vivid birefringence is characteristic.
Image Tags: mafic-mineral high-relief high-birefringence conchoidal-fracture
olivine01AMxp-600.jpg Unique Identification: Olivine
Site name: Lake of the Woods
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Amy Myrbo
Notes: Olivine
Image Tags: none
olivine02AMcp-600.jpg Unique Identification: Olivine
Site name: Lake of the Woods
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Amy Myrbo
Notes: Olivine
Image Tags: none
Opal_01_pp_AB-600.jpg Unique Identification: Opal
Site name: Lake Malawi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: opal, diagenesis
Image Tags: none
1001_q6_01_cp-600.jpg Unique Identification: Organic-rich carbonate mud with pyrite
Site name: Lake McCarrons
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
1001_q6_01_pp-600.jpg Unique Identification: Organic-rich carbonate mud with pyrite
Site name: Lake McCarrons
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
LDF-HA1213-1B-1P-1_20cm_COREFACE_10x_pp-600.jpg Unique Identification: Organic-rich Diatom Ooze
Site name: Waswaagining/Haskell
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
LDF-HA1213-1B-1P-1_20cm_COREFACE_40x_pp-600.jpg Unique Identification: Organic-rich Diatom Ooze
Site name: Waswaagining/Haskell
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
LDF-HA1213-1B-1P-1_20cm_COREFACE_cp-600.jpg Unique Identification: Organic-rich Diatom Ooze
Site name: Waswaagining/Haskell
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
LDF-HA1213-1B-1P-1_20cm_COREFACE_40x_cp-600.jpg Unique Identification: Organic-rich Diatom Ooze
Site name: Waswaagining/Haskell
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
opx_pp3RUD11-600.jpg Unique Identification: Orthopyroxene
Site name: Round Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: pleochroic silicate pyroxene
opx_cp3RUD11-600.jpg Unique Identification: Orthopyroxene
Site name: Round Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: pleochroic silicate pyroxene
YELL2-FD-2-9_18.7CM_CP_63X_OPX-600.jpg Unique Identification: Orthopyroxene
Site name: Yellowstone
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: none
Image Tags: cleavage moderately birefringent silicate pyroxene
opx_pp2RUD11-600.jpg Unique Identification: Orthopyroxene
Site name: Round Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: pleochroic silicate pyroxene
YELL2-FD-2-9-18.7CM_OPX_PP_63X-600.jpg Unique Identification: Orthopyroxene
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: vivid orange in color in this case
Image Tags: orange pleochroic cleavage silicate pyroxene
opx_pp1RUD11-600.jpg Unique Identification: Orthopyroxene
Site name: Round Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: pleochroic silicate pyroxene
Palagonite_1ppl-600.jpg Unique Identification: Palagonite
Site name: Abyssal hill, Madeira Abyssal Plain, NE Atlantic
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of palagonitised volcanic glass, volcanic-glass
Image Tags: none
Palagonite_2ppl-600.jpg Unique Identification: Palagonite
Site name: Abyssal hill, Madeira Abyssal Plain, NE Atlantic
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of palagonitised volcanic glass, flow-banding visible in one grain (top right), volcanic-glass
Image Tags: none
LDF-MSUG13-2A-3B-1_120cm_COREFACE_10x_pp-600.jpg Unique Identification: Peat
Site name: Middle Sugarbush
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
LDF-MSUG13-2A-3B-1_120cm_COREFACE_40x_cp-600.jpg Unique Identification: Peat
Site name: Middle Sugarbush
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
LDF-MSUG13-2A-3B-1_120cm_COREFACE_40x_pp-600.jpg Unique Identification: Peat
Site name: Middle Sugarbush
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
LDF-MSUG13-2A-3B-1_120cm_COREFACE_10x_cp-600.jpg Unique Identification: Peat
Site name: Middle Sugarbush
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
Phillipsite_10_GR-600.jpg Unique Identification: Phillipsite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Guy Rothwell
Notes: broken cruciform twins and rosettes, zeolites prismatic rosettes cruciform twins
Image Tags: none
Phillipsite_11_GR-600.jpg Unique Identification: Phillipsite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Guy Rothwell
Notes: broken rosette, zeolites prismatic rosette
Image Tags: none
Phillipsite_2ppl-600.jpg Unique Identification: Phillipsite
Site name: King's Trough, NE Atlantic (44 02.80 N, 21 47.03 W)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of phillipsite crystals, mostly single and broken prismatic crystals, but including partial rosette, zeolites rosette prismatic
Image Tags: none
Phillipsite_1ppl-600.jpg Unique Identification: Phillipsite
Site name: King's Trough, NE Atlantic (44 02.80 N, 21 47.03 W)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of phillipsite crystals, mostly single and broken prismatic crystals, but also partial rosettes and a partial cruciform twin in the field, zeolites cruciform prismatic
Image Tags: none
Phillipsite_3ppl-600.jpg Unique Identification: Phillipsite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of phillipsite crystals, mostly single and broken prismatic crystals, but including broken cruciform twins and complexly intergrown crystals, zeolites rosette cruciform prismatic
Image Tags: none
Phillipsite_12_GR-600.jpg Unique Identification: Phillipsite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Guy Rothwell
Notes: cruciform twin, zeolite cruciform twin feldspar
Image Tags: none
Phillipsite_13_GR-600.jpg Unique Identification: Phillipsite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Guy Rothwell
Notes: complex rosette, zeolite rosette
Image Tags: none
pirssonite_OL_xp_JS-600.jpg Unique Identification: Pirssonite
Site name: Owens
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Joe Smoot
Notes: high birefringence
Image Tags: none
YELL92-FD2-9_20.1CM_63X_PP_LAMELLAE-600.jpg Unique Identification: Plagioclase
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: Plagioclase with twins that persist in plane light
Image Tags: twinned
plagioclase_03_cp_BVG-600.jpg Unique Identification: Plagioclase
Site name: Chungara
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent twinned medium relief low birefringent
Image Tags: none
JH08-1B-1L-1_92CM_40X_CP_EXSOLUTION-600.jpg Unique Identification: Plagioclase
Site name: Joseph Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: exsolution lamellae
Image Tags: none
Plagioclase-600.jpg Unique Identification: Plagioclase
Site name: South of Java Trench, NE Indian Ocean (9 46.53 S, 102.41.95)
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Subhedral plagioclase crystal showing polysynthetic twinning on the albite law, twinned
Image Tags: none
Plagioclase_01_pp_AB-600.jpg Unique Identification: Plagioclase
Site name: Reid Lake, ON
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: plagioclase, limestone, detrital, glaciolacustrine
Image Tags: none
YELL92-FD2-9_20.1CM_CP_63X_LAMELLAE-600.jpg Unique Identification: Plagioclase
Site name: Yellowstone
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: Twinning lamellae, with undulose extinction
Image Tags: twinned undulose-extinction
plagioclase_02_pp_BVG-600.jpg Unique Identification: Plagioclase
Site name: Chungara
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent twinned low relief low birefringent
Image Tags: none
FD-92-2-6_90.1CM_40X_PP_CRACKED_PLAG-600.jpg Unique Identification: Plagioclase
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: cracked high-relief
Plagioclase_01_xp_AB-600.jpg Unique Identification: Plagioclase
Site name: Reid Lake, ON
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: plagioclase, limestone, detrital, glaciolacustrine
Image Tags: none
FD-92-2-6_90.1CM_40X_CP_CRACKED_PLAG-600.jpg Unique Identification: Plagioclase
Site name: Yellowstone
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: cracked high-relief
plagioclase_01_cp_BVG-600.jpg Unique Identification: Plagioclase
Site name: Chungara
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent twinned low relief low birefringent
Image Tags: none
plagioclase_01_pp_BVG-600.jpg Unique Identification: Plagioclase
Site name: Chungara
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent twinned low relief low birefringent
Image Tags: none
plagioclase_02_cp_BVG-600.jpg Unique Identification: Plagioclase
Site name: Chungara
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent twinned low relief low birefringent
Image Tags: none
JH08-1B-1L-1_92CM_40X_PP_PLG-600.jpg Unique Identification: Plagioclase
Site name: Joseph Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: none
plagioclase_03_pp_BVG-600.jpg Unique Identification: Plagioclase
Site name: Chungara
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Blas Valero
Notes: transparent twinned medium relief low birefringent
Image Tags: none
polycarb_large_40x_cp0001-600.jpg Unique Identification: Polycarb Large Fragment
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
polycarb_large_10x_pp-600.jpg Unique Identification: Polycarb Large Fragment
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
polycarb_large_10x_cp-600.jpg Unique Identification: Polycarb Large Fragment
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
polycarb_large_40x_pp-600.jpg Unique Identification: Polycarb Large Fragment
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
polycarb_small_pp-600.jpg Unique Identification: Polycarb Small Fragment
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
polycarb_small_cp-600.jpg Unique Identification: Polycarb Small Fragment
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
polycarb_small_cp0002-600.jpg Unique Identification: Polycarb Small Fragment
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
polycarb_small_pp0001-600.jpg Unique Identification: Polycarb Small Fragment
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GLAD7-MAL05-1B-9E-1_86.3pyrdiatom-600.jpg Unique Identification: Pyrite
Site name: Malawi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: AM
Notes: none
Image Tags: diatom
Pyrite_pyritohedra_1ppl-600.jpg Unique Identification: Pyrite
Site name: Western edge of the Sigsbee Deep, Gulf of Mexico (23 47.80 N, 94 46.09 W)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Euhedral pyrite, forms include discrete octahedra and pyritohedra. Clumps of clay and colourless prismatic zeolite crystals also in the field, pyritohedra octahedra prismatic zeolite clay
Image Tags: none
pyrite_MR_BV_PP-600.jpg Unique Identification: Pyrite
Site name: Big Soda Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: isotropic euhedral opaque
Image Tags: none
Pyrite_pyritohedra_2ppl-600.jpg Unique Identification: Pyrite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Euhedral pyrite, forms include discrete octahedra and pyritohedra. Clumps of clay and colourless prismatic zeolite crystals also in the field, pyritohedra octahedra prismatic zeolite clay
Image Tags: none
Pyrite_10_GR-600.jpg Unique Identification: Pyrite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Guy Rothwell
Notes: pyrityohedra zeolites
Image Tags: none
pyrite_pp_01-600.jpg Unique Identification: Pyrite
Site name: Crater Lake
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: none
Image Tags: none
Pyrite_01_pp_BVG-600.jpg Unique Identification: Pyrite
Site name: Titicaca
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Blas Valero
Notes: opaque isotropic euhedral cubic
Image Tags: none
Framboidal_pyrite_3ppl-600.jpg Unique Identification: Pyrite
Site name: Angola Basin, SE Atlantic (19 11.26 S, 9 23.17 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Cluster of framboidal pyrite enclosed within centric diatom frustule, isolated and clustered pyrite framboids and biogenic siliceous debris also in the field, framboid centric-diatoms siliceous-debris biogenic-silica
Image Tags: none
Pyrite_framboids_1ppl-600.jpg Unique Identification: Pyrite
Site name: Angola Basin, SE Atlantic (19 11.26 S, 9 23.17 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Dispersed framboidal pyrite, framboidal pyrite within foraminifera test, centric diatoms and diatom debris and clumps of clay in the field, framboid centric-diatoms siliceous-debris biogenic-silica clay
Image Tags: none
2C_5L_8spec4embeddedframbs-600.jpg Unique Identification: Pyrite
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 4000.0
Submitted by: Mark Shapley
Notes: Two framboidal pyrite aggregates embedded in organic matter. Under the petrographic microscope, spheres are opaque and individual crystallites are generally not resolved.
Image Tags: framboid opaque sperical crystallites polycrystalline SEM
GNRP_B10_D1_80cm_repl_sulf-600.jpg Unique Identification: Pyrite
Site name: Green Pepper Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Mark Shapley
Notes: none
Image Tags: none
2C_5L_8spec2framboids-600.jpg Unique Identification: Pyrite
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 5000.0
Submitted by: Mark Shapley
Notes: Two framboidal pyrite aggregates embedded in dispersed <1 micron pyrite crystallites. Under the petrographic microscope, disaggregated crystallites would appear as gray cloudy masses.
Image Tags: framboid opaque sperical crystallites polycrystalline SEM
1A-235Q-3_49cmFeS2framboids-600.jpg Unique Identification: Pyrite
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 3000.0
Submitted by: Mark Shapley
Notes: Framboids and disseminated crystallites of FeS2 (pyrite, lower, and possible marcasite, center) in altered volcaniclastic sandstone. Through the petrographic microscope, framboids would appear as unitary opaque spheres, and crystallites as very fine opaque euhedra or gray cloudy masses. A small fibrous bundle of the zeolite mineral erionite is visible at center left.
Image Tags: opaque black spherical framboid SEM crystallites polycrystalline sulfide marcasite
Pyrite_framboids_2ppl1-600.jpg Unique Identification: Pyrite
Site name: Angola Basin, SE Atlantic (19 11.26 S, 9 23.17 E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Clusters of framboidal pyrite enclosed within centric diatom frustules, isolated and clustered pyrite framboids and biogenic siliceous debris also in the field, framboid centric-diatoms siliceous-debris biogenic-silica
Image Tags: none
pyrite_pp_02-600.jpg Unique Identification: Pyrite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: filling-diatom
Image Tags: none
1A-235Q-3-49cm_FeS2marc_framboid_close-600.jpg Unique Identification: Pyrite
Site name: Paleolake Idaho
Light type: Scanning Electron Micrograph
Magnification: 10000.0
Submitted by: Mark Shapley
Notes: Complexly tiled and twinned FeS2 framboid from an altered volcaniclastic sandstone; possibly marcasite. An opaque unitary sphere through the petrographic scope.
Image Tags: opaque black spherical framboid SEM marcasite crystallites polycrystalline sulfide
MOMOS-WOO06-7A-1P-4_148_pyx_xpl_40x-600.jpg Unique Identification: Pyroxene
Site name: Lake of the Woods
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Val Stanley
Notes: 90 degree cleavages
Image Tags: high-relief perpendicular-cleavage
MOMOS-WOO06-7A-1P-4_148_pyx_ppl_40x-600.jpg Unique Identification: Pyroxene
Site name: Lake of the Woods
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Val Stanley
Notes: 90 degree cleavages
Image Tags: green high-relief perpendicular-cleavage
BHRS13-1B-2B-1_11_2cm_pyrox_pheno400pp-600.jpg Unique Identification: Pyroxene
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Large dark-colored magmatic pyroxene grain from a basaltic tephra originating in the Snake River Plain, Idaho. Fragmentary plant matter underlies the grain.
Image Tags: pyroxene mafic-mineral moderate-birefringence prismatic ferromagnesian
BHRS13-1B-2B-1_11_2cm_pyrox_pheno400cp-600.jpg Unique Identification: Pyroxene
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Large dark-colored magmatic pyroxene grain from a basaltic tephra originating in the Snake River Plain, Idaho. First-and-second-order birefringence is obscured by strong grain coloration.
Image Tags: pyroxene mafic-mineral moderate-birefringence prismatic ferromagnesian
TAS-ARTH11-1B-1P-1_6CM_PPL_40X_QZ_INCLUSIONS-600.jpg Unique Identification: Quartz
Site name: Arthurs Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Note inclusions in quartz, likely rutilated
Image Tags: rutilated
quartz_xp_02-600.jpg Unique Identification: Quartz
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: well-rounded; stain
Image Tags: none
quartz_xp_01-600.jpg Unique Identification: Quartz
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: Well-rounded; sand-sized grain gives higher-order birefringence colors that expected for typical quartz silt.
Image Tags: none
GEGO-STLR11-1A-1P-1_54.2CM_40X_PPL_QZ_INC_TRAILS-600.jpg Unique Identification: Quartz
Site name: St. Louis River
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Note inclusion trails within quartz grain
Image Tags: none
Quartz_02_pp_AB-600.jpg Unique Identification: Quartz
Site name: South Fraserdale, ON
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: angular quartz, detrital, glaciolacustrine
Image Tags: none
Quartz_02_xp_AB-600.jpg Unique Identification: Quartz
Site name: South Fraserdale, ON
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: angular quartz, detrital, glaciolacustrine
Image Tags: none
Quartz_01_xp_AB_undulose_extinction-600.jpg Unique Identification: Quartz
Site name: Reid Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: Angular quartz, undulose extinction, detrital, glaciolacustrine
Image Tags: none
Quartz_01_pp_AB_undulose_extinction-600.jpg Unique Identification: Quartz
Site name: Reid Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: angular quartz, undulose extinction, detrital, glaciolacustrine
Image Tags: none
quartz_pp_02-600.jpg Unique Identification: Quartz
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: well-rounded; stain
Image Tags: none
Angular_quartz-600.jpg Unique Identification: Quartz
Site name: not specified
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of poorly sorted angular quartz grains, anhedral
Image Tags: none
Karupa-UPK10-2E-1P1-600.jpg Unique Identification: Quartz
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: Rutilated
Image Tags: none
quartz_pp_01-600.jpg Unique Identification: Quartz
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: rounded coarse-grained
Image Tags: none
rhodochrosite_MDS_pp1-600.jpg Unique Identification: Rhodochrosite
Site name: Lewis
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: pleochroic xrd-confirmation
Image Tags: none
rhodocrosite_MDS_cp2-600.jpg Unique Identification: Rhodochrosite
Site name: Lewis
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: pleochroic xrd-confirmation
Image Tags: none
rhodochrosite_MDS_pp2-600.jpg Unique Identification: Rhodochrosite
Site name: Lewis
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: pleochroic xrd-confirmation
Image Tags: none
rhodochrosite_MDS_pp3-600.jpg Unique Identification: Rhodochrosite
Site name: Lewis
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: pleochroic xrd-confirmation
Image Tags: none
rhodochrosite_MDS_cp1-600.jpg Unique Identification: Rhodochrosite
Site name: Lewis
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: pleochroic xrd-confirmation
Image Tags: none
rhodochrosite_MDS_cp3-600.jpg Unique Identification: Rhodochrosite
Site name: Lewis
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: pleochroic xrd-confirmation
Image Tags: none
1A-8L-1_39cmspec1a_Tiphase-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 4000.0
Submitted by: Mark Shapley
Notes: Diagenetic rutile aggregate, showing inter-penetrating twinned blades; composition by EDX
Image Tags: diagenetic elongate acicular twinned SEM
1A-8L-1_39cmspec1_Tiphase-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 1500.0
Submitted by: Mark Shapley
Notes: Diagenetic rutile aggregate; composition by EDX. Under petrographic scope, individual acicular prisms are tiny, have high relief, and very high birefringence for their size.
Image Tags: diagenetic elongate acicular twinned SEM
1A-8L-1_39cmspec2_Tiphase-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 5000.0
Submitted by: Mark Shapley
Notes: Diagenetic rutile aggregate; composition by EDX
Image Tags: diagenetic twinned
1A-8L-1_39cmspec25_arrowheadTiO2-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 8000.0
Submitted by: Mark Shapley
Notes: Twinned diagenetic rutile, composition by EDX.
Image Tags: arrowhead twinned diagenetic SEM
BOS_rutile_pp-600.jpg Unique Identification: Rutile
Site name: Lake Bosumtwi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
MUB17-1A-8L-1_26cm_630largeTiO2cp-600.jpg Unique Identification: Rutile
Site name: Mubwindi Swamp, Uganda
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Unusually large titanium-bearing mineral grain from basal material underlying a tropical peatland. Grains from this interval analyzed by energy dispersive xray spectrometry (EDX) show simple compositions near that of rutile (TiO2).
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
MUB17-1A-8L-1_26cm_630dualTiO2pp-600.jpg Unique Identification: Rutile
Site name: Mubwindi Swamp, Uganda
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Two high-relief titanium-bearing mineral grains (6 o'clock and 12 o'clock) from basal material underlying a tropical peatland.
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
MUB17-1A-8L-1_26cm_typicalTIO2630pp-600.jpg Unique Identification: Rutile
Site name: Mubwindi Swamp, Uganda
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Common simple grain form of diagenetic TiO2, showing prismatic habit, very high relief and prominent cleavage. Grains from this interval analyzed by energy dispersive xray spectrometry (EDX) show simple compositions near that of rutile (TiO2).
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage prismatic
L_Harding_Z_sec_5_1287_rutile_I_CP-600.jpg Unique Identification: Rutile
Site name: Little Harding Lake
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Apparent diagenetic rutile associated with altered mafic silicates, opaques and abundant organic matter
Image Tags: diagenetic
MUB17-1A-8L-1_26cm_630largeTiO2_2pp-600.jpg Unique Identification: Rutile
Site name: Mubwindi Swamp, Uganda
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Unusually large titanium-bearing mineral grain from basal material underlying a tropical peatland. Peculiar grain shape appears to reflect paragenesis as a complex diagenetic aggregate.
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
MUB17-1A-8L-1_26cm_630largeTiO2pp-600.jpg Unique Identification: Rutile
Site name: Mubwindi Swamp, Uganda
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Unusually large titanium-bearing mineral grain from basal material underlying a tropical peatland. Grains from this interval analyzed by energy dispersive xray spectrometry (EDX) show simple compositions near that of rutile (TiO2).
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
L_Harding_Z_sec_5_1287_rutile_II_PP-600.jpg Unique Identification: Rutile
Site name: Little Harding Lake
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Apparent diagenetic rutile associated with altered mafic silicates, opaques and abundant organic matter
Image Tags: diagenetic
1A-8L-1_39cmspec24_intergrown_Ti_K-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 3000.0
Submitted by: Mark Shapley
Notes: Diageneitc rutile needles embedding phyllosilicate grain
Image Tags: mica diagenetic twinned acicular elongate SEM
BOS_rutile_cp-600.jpg Unique Identification: Rutile
Site name: Lake Bosumtwi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
MUB17-1A-8L-1_26cm_630largeTiO2_2cp-600.jpg Unique Identification: Rutile
Site name: Mubwindi Swamp, Uganda
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Unusually large titanium-bearing mineral grain from basal material underlying a tropical peatland. Peculiar grain shape appears to reflect paragenesis as a complex diagenetic aggregate.
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
L_Harding_Z_sec_5_1287_rutile_I_PP-600.jpg Unique Identification: Rutile
Site name: Little Harding Lake
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Apparent diagenetic rutile associated with altered mafic silicates, opaques and abundant organic matter
Image Tags: diagenetic
1A-8L-1_39cm spec2_Tiphase-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 5000.0
Submitted by: Mark Shapley
Notes: Diagenetic rutile aggregate; composition by EDX
Image Tags: diagenetic twinned SEM
L_Harding_Z_sec_5_1287_rutile_II_CP-600.jpg Unique Identification: Rutile
Site name: Little Harding Lake
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Apparent diagenetic rutile associated with altered mafic silicates, opaques and abundant organic matter
Image Tags: diagenetic
1A-8L-1_39cmspec22_23_Ti_w_K_Na-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 6000.0
Submitted by: Mark Shapley
Notes: Diageneitc rutile needles embedding phyllosilicate grain
Image Tags: mica diagenetic twinned acicular elongate SEM
MUB17-1A-8L-1_26cm_630dualTiO2cp-600.jpg Unique Identification: Rutile
Site name: Mubwindi Swamp, Uganda
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Two high-relief titanium-bearing mineral grains (6 o'clock and 12 o'clock) from basal material underlying a tropical peatland.
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
1A-8L-1_39cmspec18_Ti_phase-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 4000.0
Submitted by: Mark Shapley
Notes: Complex twinned aggregate of diagenetic rutile
Image Tags: twinned elongate acicular diagenetic SEM
1A-8L-1_39cmspec11_Ti_phase-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 6000.0
Submitted by: Mark Shapley
Notes: Diagenetic rutile aggregate; composition by EDX
Image Tags: diagenetic elongate SEM
1A-8L-1_39cmspec_Ti_phase-600.jpg Unique Identification: Rutile
Site name: Mubwindi wetland
Light type: Scanning Electron Micrograph
Magnification: 4000.0
Submitted by: Mark Shapley
Notes: Diagenetic rutile aggregate embedding unidentified dark mineral
Image Tags: diagenetic twinned elongate SEM
MUB17-2C-5L-1_64cm_630sideritepp-600.jpg Unique Identification: Siderite
Site name: Mubwindi Swamp, Uganda
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Very fine twinned siderite and associated ferric oxides from a ferric tropical peatand. Siderite occurs as a high-purity deposit several cm thick.
Image Tags: diagenetic twinned high-birefringence colored
siderite_01_pp-600.jpg Unique Identification: Siderite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: twinned flared elongate
Image Tags: none
MUB17-2C-5L-1_64cm_630sideritecp-600.jpg Unique Identification: Siderite
Site name: Mubwindi Swamp, Uganda
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Very fine twinned siderite and associated ferric oxides from a ferric tropical peatand. Siderite occurs as a high-purity deposit several cm thick. Birefringence is very high for grains of this size.
Image Tags: diagenetic twinned high-birefringence colored
OSU_SnakeMonster_14B_1G_1_35sid630CP-600.jpg Unique Identification: Siderite
Site name: 'Snake Monster' Lake, OR (informal)
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Fine rhombic siderite embedded in amorphous organic matter.
Image Tags: highly-birefringent rhombic diagenetic
siderite_01_xp-600.jpg Unique Identification: Siderite
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: twinned flared elongate
Image Tags: none
OSU_SnakeMonster_14B_1G_1_35sid630PP-600.jpg Unique Identification: Siderite
Site name: 'Snake Monster' Lake, OR (informal)
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Fine rhombic siderite embedded in amorphous organic matter.
Image Tags: highly-birefringent rhombic diagenetic
slide-glass_010002-600.jpg Unique Identification: Slide Glass
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
slide-glass_010001-600.jpg Unique Identification: Slide Glass
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
slide-glass_01-600.jpg Unique Identification: Slide Glass
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
Sulfur_MR_BV_PP-600.jpg Unique Identification: Sulfur
Site name: Peten Itza
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: translucent high-birefringent yellow
Image Tags: none
Sulfur_MR_BV_CP-600.jpg Unique Identification: Sulfur
Site name: Peten Itza
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: translucent high-birefringent yellow
Image Tags: none
RDF_3A1K2_123_2_glassy_feld_400_cp-600.jpg Unique Identification: Tephra
Site name: Redfish Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Shapley
Notes: Quenched glassy rind coating euhedral feldspar grain
Image Tags: feldspar volcanic-glass overgrowth tephra
RDF_3A1K2_122_8_cryst_tephra_400_pp-600.jpg Unique Identification: Tephra
Site name: Redfish Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Shapley
Notes: Glacier Peak(?) crystal-rich tephra
Image Tags: tephra volcanic-glass crystalline mafic minerals
RDF_3A1K2_122_8_cryst_tephra_400_cp-600.jpg Unique Identification: Tephra
Site name: Redfish Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Shapley
Notes: Glacier Peak(?) crystal-rich tephra
Image Tags: tephra volcanic-glass crystalline mafic minerals
RDF_3A1K2_123_2_glassy_feldspar_400_pp-600.jpg Unique Identification: Tephra
Site name: Redfish Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Shapley
Notes: Quenched glassy rind coating euhedral feldspar grain
Image Tags: feldspar volcanic-glass overgrowth tephra
RDF_2A1K6_79_6_microtubule_XP-600.jpg Unique Identification: Tephra
Site name: Redfish Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: basaltic tephra presumed to be from Craters of the Moon basaltic province
Image Tags: basaltic mafic micro-tubule Pele's-Hair
Volcanic_glass_1_ppl-600.jpg Unique Identification: Tephra
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of volcanic glass shards showing a wide range of shard morphology, including semi-regular fragments packed with subparallel pipe vesicles and vesicular glass fragments and bubble wall shards, foraminifera and large biotite mica flake also in the field., volcanic-glass pyroclastic pipe-vesicles shards
Image Tags: none
Glacier_Pk_tephra1_MDS_cp-600.jpg Unique Identification: Tephra
Site name: Jones
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: prominent mafic minerals typical of GP. mineral-rich
Image Tags: none
amphglassrindcp-600.jpg Unique Identification: Tephra
Site name: Fish
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Mark Shapley
Notes: In cross-polarized light, glassy quenched rind is invisible along grain margins, but visible as scaly texturing disrupting birefringence on the body of the amphibole grain. From an unidentified tephra occurrence on the Kenai Peninsula, Alaska.
Image Tags: amphibole hornblende pleiochroic green prismatic quenched-rind mafic-mineral volcanic-glass
amphglassrindpp-600.jpg Unique Identification: Tephra
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Mark Shapley
Notes: Quenched magmatic rind (glassy) prominent in side view along grain margins. From an unidentified tephra occurrence on the Kenai Peninsula, Alaska.
Image Tags: amphibole hornblende pleiochroic green prismatic quenched-rind mafic-mineral volcanic-glass
Glacier_Pk_tephra1_MDS_pp-600.jpg Unique Identification: Tephra
Site name: Jones
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: prominent mafic minerals typical of GP. mineral-rich
Image Tags: none
Mazama_tephra_1_MDS_pp-600.jpg Unique Identification: Tephra
Site name: Jones
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: glassy vesicular stretched
Image Tags: none
RDF_2A1K6_79_6_microtubule_400X_PP-600.jpg Unique Identification: Tephra
Site name: Redfish Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: basaltic tephra presumed to be from Craters of the Moon basaltic province
Image Tags: basaltic mafic micro-tubule Pele's-Hair
RDF_3A1K2_122_8_cryst_tephra_100_cp-600.jpg Unique Identification: Tephra
Site name: Redfish Lake, ID
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Shapley
Notes: Glacier Peak(?) crystal-rich tephra
Image Tags: tephra volcanic-glass crystalline mafic minerals
Mazama_tephra_1_MDS_cp-600.jpg Unique Identification: Tephra
Site name: Jones
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: analyzer <90 deg. glassy vesicular stretched
Image Tags: none
YELL2-FD2-9-106.7CM-GREEN_VOLX-600.jpg Unique Identification: Tephra
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: green vesicular
RDF_3A1K2_122_8_cryst_tephra_100_pp-600.jpg Unique Identification: Tephra
Site name: Redfish Lake, ID
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Shapley
Notes: Glacier Peak(?) crystal-rich tephra
Image Tags: tephra volcanic-glass crystalline mafic minerals
YELL2-FD2-9-106.7CM_GREEN_VOLX_CP_40X-600.jpg Unique Identification: Tephra
Site name: Yellowstone
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Highly vesicular volcanic shard
Image Tags: vesicular
GNP-SWF10-3D-6L-1-W_30.5cm_GlacierPeakG_bottom_10x_cp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_30.5cm_GlacierPeakG_bottom_40x_pp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_29.5cm_GlacierPeakG_top_40x_pp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_29.5cm_GlacierPeakG_top_63x_cp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_29.5cm_GlacierPeakG_top_63x_pp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_30.5cm_GlacierPeakG_bottom_40x_cp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_29.5cm_GlacierPeakG_top_40x_cp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_29.5cm_GlacierPeakG_top_10x_cp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_29.5cm_GlacierPeakG_top_10x_pp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_30.5cm_GlacierPeakG_bottom_10x_pp-600.jpg Unique Identification: Tephra - Glacier Peak G
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
CoMtephra1_CP_100X-600.jpg Unique Identification: Tephra - mafic
Site name: Redfish Lake
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: volc glass, magnetite, oxide coatings, mafic minerals, feldspars
Image Tags: none
CoMtephra3_CP_100X-600.jpg Unique Identification: Tephra - mafic
Site name: Redfish Lake
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: volc glass lath or thread fragment ('Pele's hair'?), oivine(?), other mafics
Image Tags: none
CoMtephra3_PP_100X-600.jpg Unique Identification: Tephra - mafic
Site name: Redfish Lake
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: volc glass lath or thread fragment ('Pele's hair'?), oivine(?), other mafics
Image Tags: none
CoMtephra5_PP_200X-600.jpg Unique Identification: Tephra - mafic
Site name: Redfish Lake
Light type: Plane-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: volc glass, oxide coatings
Image Tags: none
CoMtephra5_CP_200X-600.jpg Unique Identification: Tephra - mafic
Site name: Redfish Lake
Light type: Cross-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: volc glass, oxide coatings
Image Tags: none
CoMtephra2_CP_100X-600.jpg Unique Identification: Tephra - mafic
Site name: Redfish Lake
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: olivine, volcanic glass
Image Tags: none
CoMtephra2_PP_100X-600.jpg Unique Identification: Tephra - mafic
Site name: Redfish Lake
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: olivine, volcanic glass
Image Tags: none
CoMtephra1_PP_100X-600.jpg Unique Identification: Tephra - mafic
Site name: Redfish Lake
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: volc glass, magnetite, oxide coatings, mafic minerals, feldspars
Image Tags: tephra volcanic-glass crystalline mafic minerals
CoMtephra4_CP_100X-600.jpg Unique Identification: Tephra - mafic
Site name: Redfish Lake
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: not specified
Notes: none
Image Tags: none
WOW07_1B1K6_25_1_PP_400X_wb-600.jpg Unique Identification: Tephra - Mount Saint Helens Y
Site name: Wallowa
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
WOW07_1B1K6_25_1_CP_400X-600.jpg Unique Identification: Tephra - Mount Saint Helens Y
Site name: Wallowa
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
WOW07_1B1K6_23_1_PP_400X_wb-600.jpg Unique Identification: Tephra - Mount Saint Helens Y
Site name: Wallowa
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
WOW07_1B1K6_23_1_CP_400X-600.jpg Unique Identification: Tephra - Mount Saint Helens Y
Site name: Wallowa
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
WOW07_1B1K6_26_6PP_100X_wb-600.jpg Unique Identification: Tephra - Mount Saint Helens Y
Site name: Wallowa
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
WOW07_1B1K6_26_6CP_100X-600.jpg Unique Identification: Tephra - Mount Saint Helens Y
Site name: Wallowa
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_34.5cm_MtStHelensJ_63x_pp-600.jpg Unique Identification: Tephra - Mt. St. Helens J
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_34.5cm_MtStHelensJ_40x_cp-600.jpg Unique Identification: Tephra - Mt. St. Helens J
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_34.5cm_MtStHelensJ_63x_cp-600.jpg Unique Identification: Tephra - Mt. St. Helens J
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_34.5cm_MtStHelensJ_10x_cp-600.jpg Unique Identification: Tephra - Mt. St. Helens J
Site name: Swiftcurrent Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_34.5cm_MtStHelensJ_40x_pp-600.jpg Unique Identification: Tephra - Mt. St. Helens J
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
GNP-SWF10-3D-6L-1-W_34.5cm_MtStHelensJ_10x_pp-600.jpg Unique Identification: Tephra - Mt. St. Helens J
Site name: Swiftcurrent Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
PTT07_1C1K1_68_7CP_200X-600.jpg Unique Identification: Tephra- Mazama
Site name: Pettit
Light type: Cross-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1C1K1_73_9PP_200X_wb-600.jpg Unique Identification: Tephra- Mazama
Site name: Pettit
Light type: Plane-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1C1K1_68_7PP_200Xwb-600.jpg Unique Identification: Tephra- Mazama
Site name: Pettit
Light type: Plane-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1C1K1_73_9PP_100X_wb-600.jpg Unique Identification: Tephra- Mazama
Site name: Pettit
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1C1K1_73_9CP_100X-600.jpg Unique Identification: Tephra- Mazama
Site name: Pettit
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1C1K1_73_9CP_200X-600.jpg Unique Identification: Tephra- Mazama
Site name: Pettit
Light type: Cross-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1C1K1_68_7CP_100XA-600.jpg Unique Identification: Tephra- Mazama
Site name: Pettit
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1C1K1_68_7PP_100XA_wb-600.jpg Unique Identification: Tephra- Mazama
Site name: Pettit
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
MEDS21A-1G-1_42_TiO2_2_630pp-600.jpg Unique Identification: Titanite
Site name: Medicine Lake, MT
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Titanium-bearing mineral phase from a late-Holocene dessication horizon in Medicine Lake, MT. The extreme relief and acute twinning angle are characteristic of Ti oxides. Specimens from this interval analyzed by energy-dispersive Xray spectrometry (EDX) show complex compositions suggesting titanite (CaTiSiO5) rather than rutile (TiO2).
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
MEDS21A-1G-1_42_TiO2_2_630cp-600.jpg Unique Identification: Titanite
Site name: Medicine Lake, MT
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Titanium-bearing mineral phase from a late-Holocene dessication horizon in Medicine Lake, MT. Prominent birefringent colors are obscured by the strong dispersion of the high-density grain.
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
MEDS21A-1G-1_42_TiO2630cp-600.jpg Unique Identification: Titanite
Site name: Medicine Lake, MT
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Titanium-bearing mineral phase from a late-Holocene dessication horizon in Medicine Lake, MT. Prominent birefringent colors are obscured by the strong dispersion of the high-density grain.
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
MEDS21A-1G-1_42_TiO2630pp-600.jpg Unique Identification: Titanite
Site name: Medicine Lake, MT
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Titanium-bearing mineral phase from a late-Holocene dessication horizon in Medicine Lake, MT. The extreme relief and acute twinning angle are characteristic of Ti oxides. Specimens from this interval analyzed by energy-dispersive Xray spectrometry (EDX) show complex compositions suggesting titanite (CaTiSiO5) rather than rutile (TiO2).
Image Tags: twinned heavy-mineral high-relief high-birefringence diagenetic cleavage
toothpick_shavings_40x_pp-600.jpg Unique Identification: Toothpick
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
toothpick_shavings_10x_pp-600.jpg Unique Identification: Toothpick
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
toothpick_shavings_40x_cp-600.jpg Unique Identification: Toothpick
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
toothpick_shavings_10x_cp-600.jpg Unique Identification: Toothpick
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
toothpick_shavings_10x_pp-600.jpg Unique Identification: Toothpick
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
toothpick_cp-600.jpg Unique Identification: Toothpick
Site name: not specified
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
toothpick_pp-600.jpg Unique Identification: Toothpick
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
TAS-ARTH11-1B-1P-1_94cm_tourmaline3_cp-600.jpg Unique Identification: Tourmaline
Site name: Arthurs Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
TAS-ARTH11-1B-1P-1_94cm_tourmaline3_pp-600.jpg Unique Identification: Tourmaline
Site name: Arthurs Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: pleochroic
tourmaline_pp_01-600.jpg Unique Identification: Tourmaline
Site name: Tanners
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: prismatic blunt-ended faceted
Image Tags: none
tourmaline_xp_01-600.jpg Unique Identification: Tourmaline
Site name: Tanners
Light type: Cross-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: prismatic blunt-ended faceted
Image Tags: none
TAS-ARTH11-1B-1P-1_94cm_tourmaline1_pp-600.jpg Unique Identification: Tourmaline
Site name: Arthurs Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: pleochroic
TAS-ARTH11-1B-1P-1_80CM_PP_63X_BLK_TRML-600.jpg Unique Identification: Tourmaline
Site name: Arthurs Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: none
Image Tags: black euhedral
TAS-ARTH11-1B-1P-1_94cm_tourmaline2_pp-600.jpg Unique Identification: Tourmaline
Site name: Arthurs Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: pleochroic
trona_OL_JS-600.jpg Unique Identification: Trona
Site name: Owens
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Joe Smoot
Notes: high relief, striated and acicular, monoclinic
Image Tags: none
trona_OL_xp_JS-600.jpg Unique Identification: Trona
Site name: Owens
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Joe Smoot
Notes: high birefringence, striated and acicular, monoclinic
Image Tags: none
PTT07_1A1K2_84_5PP_200X_NEW-600.jpg Unique Identification: Turbidite sequence
Site name: Pettit
Light type: Plane-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
CARL-TWTW11-3D-5B-1-W_83cm_turbidite_10x_cp-600.jpg Unique Identification: Turbidite sequence
Site name: Twin Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
PTT07_1A1K2_82_3PP_400X-600.jpg Unique Identification: Turbidite sequence
Site name: Pettit
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
CARL-TWTW11-3D-5B-1-W_83cm_turbidite_40x_pp-600.jpg Unique Identification: Turbidite sequence
Site name: Twin Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
PTT07_1A1K2_84_5CP_200X-600.jpg Unique Identification: Turbidite sequence
Site name: Pettit
Light type: Cross-Polarized Light
Magnification: 200.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1A1K2_78_6CP_1000X-600.jpg Unique Identification: Turbidite sequence
Site name: Pettit
Light type: Cross-Polarized Light
Magnification: 1000.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1A1K2_82_3CP_400X-600.jpg Unique Identification: Turbidite sequence
Site name: Pettit
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
PTT07_1A1K2_80_2PP_400X-600.jpg Unique Identification: Turbidite sequence
Site name: Pettit
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
CARL-TWTW11-3D-5B-1-W_83cm_turbidite_40x_cp-600.jpg Unique Identification: Turbidite sequence
Site name: Twin Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
PTT07_1A1K2_78.6PP_1000X_wb-600.jpg Unique Identification: Turbidite sequence
Site name: Pettit
Light type: Plane-Polarized Light
Magnification: 1000.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
CARL-TWTW11-3D-5B-1-W_83cm_turbidite_10x_pp-600.jpg Unique Identification: Turbidite sequence
Site name: Twin Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
PTT07_1A1K2_80_2CP_400X-600.jpg Unique Identification: Turbidite sequence
Site name: Pettit
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: none
Image Tags: none
DCH-CHL16-1E-30E-2_55cm_vivi_pleio630cp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned vivianite fans in a matrix of diatom ooze.
Image Tags: pleiochroic blue twinned phosphate diagenetic
ironfest_10x_ppl_oxidation_viv_lim_pyr-600.jpg Unique Identification: Vivianite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: iron rich assemblage
Image Tags: blue
BHRS13-2B-5L-1_17_1cm_cp0630-600.jpg Unique Identification: Vivianite
Site name: Bay Horse Lake, Idaho
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Fine-grained, high-purity occurrence of vivianite, interpreted as an endogenic precipitate from waters rich in Fe(2+) and PO4(3-) - rich waters. Mineral occurrence is localized within lamellae in late-Pleistocene glaciolacustrine sediments.
Image Tags: phosphate pleiochroic diagenetic ferrous blue prismaticendogenic
DCH-CHL16-1E-30E-2_22cm_pleio_in_ooze630cp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Spectacular twinned vivianite fan in a matrix of diatom ooze. Appearance of interference colors is altered by strong and variable mineral color.
Image Tags: pleiochroic blue twinned phosphate diagenetic
DCH-CHL16-1E-30E-2_55cm_vivianite630cp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned vivianite fans, showing the effects of orientation on optical behavior.
Image Tags: pleiochroic blue twinned phosphate diagenetic
DCH-CHL16-1E-30E-2_55cm_no2_pleio630cp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned bundles of acicular vivianite.
Image Tags: pleiochroic blue twinned phosphate acicular
CHAL_vivianite_pp_blue-600.jpg Unique Identification: Vivianite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
DCH-CHL16-1E-30E-2_55cm_vivianite630pp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned vivianite fans, showing the effects of orientation on optical behavior.
Image Tags: pleiochroic blue twinned phosphate diagenetic
TRIG15-1A_7L_1_35cm_630pp_viv-600.jpg Unique Identification: Vivianite
Site name: Triangle Lake Bog, Ohio
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Prismatic to tabular vivianite from a peatland in Ohio. Unusual orthogonal twinning accentuates pleiochroism in plane-polarized light.
Image Tags: pleiochroic blue twinned phosphate diagenetic
DCH-CHL16-1E-30E-2_55cm_no2_pleio_630pp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned bundles of acicular vivianite showing pleiochroic effects of grain orientation; major axis of the twinned aggregate is nearparallel to polarizer and shows maximum color.
Image Tags: pleiochroic blue twinned phosphate acicular
BHRS13-2B-5L-1_37_1cm_pp100-600.jpg Unique Identification: Vivianite
Site name: Bay Horse Lake, Idaho
Light type: Plane-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: Spectacular occurrence of large, bladed vivianite in organic-poor late Pleistocene glaciolacustrine sediments. The 3-mm nodule appears black in the split and oxidized core face. Close to 100% of material in the field of view is vivianite.
Image Tags: phosphate pleiochroic diagenetic ferrous blue bladed
TRIG15-1A_7L_1_35cm_400cp_viv-600.jpg Unique Identification: Vivianite
Site name: Triangle Lake Bog, Ohio
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Prismatic to tabular vivianite from a peatland in Ohio.
Image Tags: pleiochroic blue twinned phosphate diagenetic
GLAD5-VC04-1A-22H-1_146.8cm_pp_40x_viv-600.jpg Unique Identification: Vivianite
Site name: Valles Caldera
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: blue
DCH-CHL16-1E-30E-2_22cm_viv_in_ooze630pp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned vivianite fan in orientation near parallel to analyzer; density of color in plane-polarized light is maximized. Matrix of isotropic diatom frustules.
Image Tags: pleiochroic blue twinned phosphate diagenetic
TRIG15-1A_7L_1_35cm_400pp_viv-600.jpg Unique Identification: Vivianite
Site name: Triangle Lake Bog, Ohio
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Prismatic to tabular vivianite from a peatland in Ohio. Unusual orthogonal twinning accentuates pleiochroism in plane-polarized light.
Image Tags: pleiochroic blue twinned phosphate diagenetic
DCH-CHL16-1E-30E-2_22cm_viv_in_ooze630cp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned vivianite fan in orientation near parallel to analyzer; most of the fan elements are near optical extinction.
Image Tags: pleiochroic blue twinned phosphate diagenetic
DCH-CHL16-1E-30E-2_22cm_pleio_in_ooze630pp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Spectacular twinned vivianite fan in a matrix of diatom ooze. Pleiochroism is highlighted by the fan geometry, showing dependence of color on orientation.
Image Tags: pleiochroic blue twinned phosphate diagenetic
DCH-CHL16-1E-30E-2_55cm_no2_630cp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned bundles of acicular vivianite.
Image Tags: pleiochroic blue twinned phosphate acicular diagenetic
vivianite.MR_BV_PP-600.jpg Unique Identification: Vivianite
Site name: Iceland Lake
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: colored blue translucent euhedral cleavage monoclinic
Image Tags: none
IRONFEST_10x_xpl_vivianite_limonite_pyrite-600.jpg Unique Identification: Vivianite
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: iron rich assemblage
Image Tags: birefringent euhedral
CHAL_vivianite_cp-600.jpg Unique Identification: Vivianite
Site name: not specified
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
IRONFEST_10x_ppl_vivianite_limonite_pyrite-600.jpg Unique Identification: Vivianite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: iron rich assemblage
Image Tags: blue
vivianite_MDS_cp1-600.jpg Unique Identification: Vivianite
Site name: Valles Caldera
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: atypical occurrence, near-pure vivianite. dissagregated-nodule
Image Tags: none
TRIG15-1A_7L_1_35cm_630cp_viv-600.jpg Unique Identification: Vivianite
Site name: Triangle Lake Bog, Ohio
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Prismatic to tabular vivianite from a peatland in Ohio.
Image Tags: pleiochroic blue twinned phosphate diagenetic
vivianite_pp_01-600.jpg Unique Identification: Vivianite
Site name: Twin
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: none
Image Tags: none
DCH-CHL16-1E-30E-2_55cm_vivi_pleio630pp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned vivianite fans in a matrix of diatom ooze.
Image Tags: pleiochroic blue twinned phosphate diagenetic
vivianite_MDS_pp1-600.jpg Unique Identification: Vivianite
Site name: Valles Caldera
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: atypical occurrence, near-pure vivianite. dissagregated-nodule
Image Tags: none
vivianite.MR_BV_CP-600.jpg Unique Identification: Vivianite
Site name: Iceland Lake
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: colored blue translucent euhedral cleavage monoclinic
Image Tags: none
DCH-CHL16-1E-30E-2_55cm_no2_630pp-600.jpg Unique Identification: Vivianite
Site name: Lake Challa, Tanzania
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Twinned bundles of acicular vivianite showing pleiochroic effects of grain orientation; major axis of the twinned aggregate is near perpendicular to polarizer and shows minimal color.
Image Tags: pleiochroic blue twinned phosphate acicular
CHAL_vivianite_pp-600.jpg Unique Identification: Vivianite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
BHRS13-2B-5L-1_37_1cm_cp0100-600.jpg Unique Identification: Vivianite
Site name: Bay Horse Lake, Idaho
Light type: Cross-Polarized Light
Magnification: 100.0
Submitted by: Mark Shapley
Notes: Spectacular occurrence of large, bladed vivianite in organic-poor late Pleistocene glaciolacustrine sediments. This is an unusual case where large grain size renders vivianite birefringence prominent.
Image Tags: phosphate pleiochroic diagenetic ferrous blue bladed
BHRS13-2B-5L-1_17_1cm_pp630-600.jpg Unique Identification: Vivianite
Site name: Bay Horse Lake, Idaho
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Mark Shapley
Notes: Fine-grained, high-purity occurrence of vivianite, interpreted as an endogenic precipitate from waters rich in Fe(2+) and PO4(3-) - rich waters. Mineral occurrence is localized within lamellae in late-Pleistocene glaciolacustrine sediments. Pleiochroism maximizes color in near-parallel (vertical) grain orientations.
Image Tags: phosphate pleiochroic diagenetic ferrous blue prismatic endogenic
BHRS13-1B-2B-1_11_2cm_palagonglasspp400-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Partially altered volcanic glass from a basaltic tephra originating in the Snake River Plain, ID. Altered regions (palagonitized?) are yellowish-brown.
Image Tags: volcanic-glass low-birefringent zeolite alteration
PTT_1A1K2_75_4_n03_400X_PP-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Glacier Peak 'G'(?) tephra; vesicular pumice fragment.
Image Tags: none
BHRS13-1B-2B-1_11_2cm_pumice400pp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Highly vesicular (pumaceous) volcanic glass from a basaltic tephra originating in the Snake River Plain, Idaho. Vesicles give colorless glass an opaque appearance in plane-polarized light.
Image Tags: volcanic-glass vesicular bubbles dark isotropic
BHRS13-1B-2B-1_11_2cm_vesicular_glass400pp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Sharp vesicular shard of basaltic glass originating in the Snake River Plain, Idaho. Small altered show as birefringent patches.
Image Tags: volcanic-glass alteration vesicular isotropic zeolite
Mazama_tephra_2_MDS_pp-600.jpg Unique Identification: Volcanic Glass
Site name: Jones
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: glassy vesicular stretched
Image Tags: none
YELL2-FD2-9_106.7CM_GLASS_BUBBLES_63X_PP-600.jpg Unique Identification: Volcanic Glass
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: volcanic glass shard with bubble junctions still intact
Image Tags: vesicular volcanic
PTT_1A1K1_100_2_PP_400X-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Mt. St. Helens 'Y' series(?) tephra
Image Tags: none
BHRS13-1B-2B-1_11_2cm_vesicular_glass_pal400pp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Partially altered (palagonitic?) volcanic glass from a basaltic tephra originating in the Snake River Plain, Idaho. Altered regions show yellowish-brown discoloration of near-colorless fresh glass.
Image Tags: volcanic-glass low-birefringent zeolite alteration
BHRS13-1B-2B-1_11_2cm_pumice400cp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Highly vesicular (pumaceous) volcanic glass from a basaltic tephra originating in the Snake River Plain, Idaho. Almost wholly isotropic in cross-polarized light.
Image Tags: volcanic-glass vesicular bubbles dark isotropic
PTT_1A1K1_100_CP_400X-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Mt. St. Helens 'Y' series(?) tephra
Image Tags: vesicular isotropic
BHRS13-1B-2B-1_11_2cm_vesicular_glass_pal400cp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Partially altered (palagonitic?) volcanic glass from a basaltic tephra originating in the Snake River Plain, Idaho. Altered regions show diffuse, low-order birefringence.
Image Tags: volcanic-glass low-birefringent zeolite alteration
PTT_1A1K2_75_4_n04_400X_CP-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Glacier Peak 'G'(?) tephra
Image Tags: conchoidal isotropic
PTT_1A1K2_75_4_400X_PP-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Glacier Peak 'G'(?) tephra
Image Tags: none
Tephra_01_pp_AB-600.jpg Unique Identification: Volcanic Glass
Site name: Evans Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: volcanic ash, tephra
Image Tags: none
BHRS13-1B-2B-1_11_2cm_dark_glass400pp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Concoidally fractured, strongly colored volcanic glass from a basaltic tephra originating in the Snake River Plain, Idaho. Insect wing to the right provides textural aesthetic counterpoint.
Image Tags: conchoidal-fracture volcanic-glass dark isotropic
Volcanic_glass_2_ppl-600.jpg Unique Identification: Volcanic Glass
Site name: Tyrrhenian Sea, Mediterranean
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Field of volcanic glass shards showing a wide range of shard morphology, including semi-regular fragments packed with subparallel pipe vesicles and vesicular glass fragments and bubble wall shards, volcanic-glass pyroclastic pipe-vesicles shards
Image Tags: none
RDF_2A1K6_79_6_400X_PP-600.jpg Unique Identification: Volcanic Glass
Site name: Redfish Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Basaltic tephra, probably from the Snake River Plain. Fine mineral inclusions in vesicle.
Image Tags: mafic_tephra colored vesicular inclusions isotropic
RDF_2A1K6_79_6_400X_CP-600.jpg Unique Identification: Volcanic Glass
Site name: Redfish Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Basaltic tephra, probably from the Snake River Plain. Fine mineral inclusions in vesicle.
Image Tags: mafic_tephra colored vesicular inclusions isotropic
BHRS13-1B-2B-1_11_2cm_colored_glass400Xcp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Sand-sized vesicular glass from a basaltic tephra originating in the Snake River Plain, Idaho. Most of the glass is fully extinct in cross-polarized light.
Image Tags: volcanic-glass vesicular isotropic greenish-brown dark
PTT_1A1K1_100_2_CP_400X-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Mt. St. Helens 'Y' series(?) tephra
Image Tags: isotropic
YELL2-FD2-9_106.7CM_63X_GLASS_INCLUSIONS-600.jpg Unique Identification: Volcanic Glass
Site name: Yellowstone
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Val Stanley
Notes: Note aligned mineral inclusions
Image Tags: mineral-inclusions
PTT_1A1K2_75_4_n04_400X_PP-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Glacier Peak 'G'(?) tephra
Image Tags: none
BHRS13-1B-2B-1_11_2cm_palag_glass2_400cp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Partially altered volcanic glass from a basaltic tephra originating in the Snake River Plain, ID. Altered regions (palagonitized?) are weakly birefringent.
Image Tags: volcanic-glass low-birefringent zeolite
BHRS13-1B-2B-1_11_2cm_palagonglasscp400-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Partially altered volcanic glass from a basaltic tephra originating in the Snake River Plain, ID. Birefringent alteration is localized along a tubule in the glass fragment.
Image Tags: volcanic-glass low-birefringent zeolite alteration
BHRS-1B-3_11cm_mafic_glass_close-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake
Light type: Scanning Electron Micrograph
Magnification: 6000.0
Submitted by: Mark Shapley
Notes: High-magnification view of dense glass fragment from a basaltic tephra originating in the Snake River Plain, Idaho, showing stretched texture and cooling fractures.
Image Tags: SEM volcanic_glass conchoidal conchoidal_facture ash
BHRS13-1B-2B-1_11_2cm_colored_glass400Xpp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Sand-sized vesicular glass from a basaltic tephra originating in the Snake River Plain, Idaho. Grain at lower right is dark in plane-polarized light, while grain in upper left quadrant appears colorless.
Image Tags: volcanic-glass vesicular isotropic greenish-brown dark
BHRS13-1B-2B-1_11_2cm_palag_glass2_400pp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Partially altered volcanic glass from a basaltic tephra originating in the Snake River Plain, ID. Altered regions (palagonitized?) are yellowish and localized preferentially on vesicle walls.
Image Tags: volcanic-glass low-birefringent zeolite
PTT_1A1K2_75_4_n02_400X_CP-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Glacier Peak 'G'(?) tephra
Image Tags: isotropic conchoidal
PTT_1A1K2_75_4_400X_CP-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Glacier Peak 'G'(?) tephra
Image Tags: isotropic conchoidal
PTT_1A1K2_75_4_n03_400X_CP-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Glacier Peak 'G'(?) tephra; vesicular pumice fragment.
Image Tags: vesicular pumice
BHRS_1B-3_11cm_mafic_glass_vesic-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake
Light type: Scanning Electron Micrograph
Magnification: 2500.0
Submitted by: Mark Shapley
Notes: Vesicular glass fragment from a basaltic tephra originating in the Snake River Plain, Idaho. Vesicles will give this isotropic grain a dark, high-relief appearance in plane-polarized light through the petrographic microscope.
Image Tags: SEM volcanic_glass pumice vesicular
PTT_1A1K1_100_PP_400X-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Mt. St. Helens 'Y' series(?) tephra
Image Tags: none
YELL_Lewis_LL92-1-2K-4_79.5cm_tephra_40x_pp-600.jpg Unique Identification: Volcanic Glass
Site name: Lewis Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: shard morphologies
Image Tags: pyroclastic
BHRS-1B-3_11_cm_mafic_glass-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake
Light type: Scanning Electron Micrograph
Magnification: 1500.0
Submitted by: Mark Shapley
Notes: Dense, conchoidally fractured glass fragment from a basaltic tephra originating in the Snake River Plain, Idaho. This material is optically isotropic, but colored in plane-polarized light through the petrographic microscope.
Image Tags: SEM volcanic_glass conchoidal conchoidal_facture ash
BHRS13-1B-2B-1_11_2cm_vesicular_glass400cp-600.jpg Unique Identification: Volcanic Glass
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Sharp vesicular shard of basaltic glass originating in the Snake River Plain, Idaho. Small altered regions appear brown or yellowish.
Image Tags: volcanic-glass alteration vesicular isotropic zeolite
PTT_1A1K2_75_4_n02_400X_PP-600.jpg Unique Identification: Volcanic Glass
Site name: Pettit Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Glacier Peak 'G'(?) tephra
Image Tags: none
TAS-WDS11_1A-2B-1_84.2cm_40x_ppl_Zr-600.jpg Unique Identification: Zircon
Site name: Woods Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: characteristic shape
Image Tags: elongate high-relief
TAS-WDS11-1A-2B-1_84.2cm_xpl_40x_Zr2-600.jpg Unique Identification: Zircon
Site name: Woods Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: characteristic shape
Image Tags: elongate high-relief
BHRS13-1B-2B-1_11_2cm_mafictephra_zircpp400-600.jpg Unique Identification: Zircon
Site name: Bay Horse Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Large prismatic zircon from a basaltic tephra originating in the Snake River Plain, Idaho. The extreme relief of the mineral accentuates the intersection of prism faces as shadowed lines. Note prismatic inclusion oriented to the long axis of the zircon.
Image Tags: high-birefringence high-relief transparent mafic_tephra prismatic
TAS-WDS11-1A-2B-1_84.2cm_xpl_40x_Zr3-600.jpg Unique Identification: Zircon
Site name: Woods Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: characteristic shape
Image Tags: elongate high-relief
Zircon_3ppl-600.jpg Unique Identification: Zircon
Site name: South of Java Trench, NE Indian Ocean (9 46.53 SA, 102 41.95E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Prismatic subeuhedral zircon crystal. Note the very high relief.,
Image Tags: none
TAS-WDS11-1A-2B-1_84.2cm_xpl_40x_Zr-600.jpg Unique Identification: Zircon
Site name: Woods Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: characteristic shape
Image Tags: elongate high-relief
HELL13_1B4_61_5_pp-600.jpg Unique Identification: Zircon
Site name: Hell Roaring Lake, ID
Light type: Plane-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Occurrence in sand composed largely of reworked Mazama Ash. Striking zoning indicates multiple growth phases in magma chamber.
Image Tags: euhedral zoned inclusions heavy_mineral
Zircon_2ppl-600.jpg Unique Identification: Zircon
Site name: South of Java Trench, NE Indian Ocean (9 46.53 SA, 102 41.95E)
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Guy Rothwell
Notes: Prismatic subeuhedral zircon crystal. Note the very high relief. Mica and broken pyroxene crystal fragments also in the field. , mica pyroxene
Image Tags: none
BHRS13-1B-2B-1_11_2cm_mafictephra_zirccp400-600.jpg Unique Identification: Zircon
Site name: Bay Horse Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Large prismatic zircon from a basaltic tephra originating in the Snake River Plain, Idaho. The brilliant birefringence is characteristic of the mineral in all sizes.
Image Tags: high-birefringence high-relief transparent mafic_tephra prismatic
HELL13_1B4_61_5_cp-600.jpg Unique Identification: Zircon
Site name: Hell Roaring Lake, ID
Light type: Cross-Polarized Light
Magnification: 400.0
Submitted by: Mark Shapley
Notes: Occurrence in sand composed largely of reworked Mazama Ash. Striking zoning indicates multiple growth phases in magma chamber.
Image Tags: euhedral zoned inclusions heavy_mineral
TAS-WDS11-1A-2B-1_84.2cm_ppl_40x_Zr2-600.jpg Unique Identification: Zircon
Site name: Woods Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: characteristic shape
Image Tags: elongate high-relief
TAS-WDS11-1A-2B-1_89.4cm_xpl_40x_hex_frag-600.jpg Unique Identification: Zircon
Site name: Woods Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: characteristic shape
Image Tags: hexagonal
TAS-WDS11-1A-2B-1_89.4cm_ppl_40x_hex_frag-600.jpg Unique Identification: Zircon
Site name: Woods Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: characteristic shape
Image Tags: hexagonal
TAS-WDS11-1A-2B-1_84.2cm_ppl_40x_Zr3-600.jpg Unique Identification: Zircon
Site name: Woods Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: characteristic shape
Image Tags: elongate high-relief
zorbitrol_10x_pp-600.jpg Unique Identification: Zorbitrol
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
zorbitrol_40x_cp-600.jpg Unique Identification: Zorbitrol
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
zorbitrol_10x_cp-600.jpg Unique Identification: Zorbitrol
Site name: not specified
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Jess Rodysill
Notes: none
Image Tags: none
zorbitrol_40x_pp-600.jpg Unique Identification: Zorbitrol
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Jess Rodysill
Notes: none
Image Tags: none

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