|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
|
|
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
|
