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Id 59
Identification Type Mineral
Name Vivianite
Distinguishing Features Blue
Pleochroic
Description Blue in both plane and cross-polarized light. May occur in diagenetic sprays, euhedra, nodules, and coatings. Low birefringence. In core face, chalky white when reduced; bright blue when oxidized. Associated with organic matter, bones, teeth, seeds, and other environments with available phosphate and reduced iron. Commonly found in lacustrine and estuarine sediments. Not common in marine sediments.
Tags phosphate
transparent
diagenetic
ferrous
External Resources Vivianite on MinDat
Imposters
Images
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
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
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
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
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
Unique Identification: Vivianite
Site name: Twin
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: none
Image Tags: none
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Unique Identification: Vivianite
Site name: Valles Caldera
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: blue
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
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
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
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
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
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
Unique Identification: Vivianite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Unique Identification: Vivianite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Unique Identification: Vivianite
Site name: not specified
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none