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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: 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
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: Twin
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: none
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: 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