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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
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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
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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
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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
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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
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Unique Identification: Vivianite
Site name: Twin
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: none
Image Tags: none
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Unique Identification: Vivianite
Site name: Valles Caldera
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: blue
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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
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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
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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
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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
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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
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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
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Unique Identification: Vivianite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
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Unique Identification: Vivianite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
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Unique Identification: Vivianite
Site name: not specified
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
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