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Id 5
Identification Type Mineral
Name Pyrite
Distinguishing Features Opaque
euhedral
Description Opaque (black). Yellow in reflected light. Pleochroism and birefringence not applicable. Euhedral, framboidal, space-filling shapes. May coat or replace organic matter. Occurs in organic-rich or reduced sediments. Common in lacustrine, wetland, estuarine, and marine environments.
Tags Cubic
Octahedral
Framboidal
sulfide
External Resources Pyrite on MinDat
Imposters
Images
Unique Identification: Pyrite
Site name: Crater Lake
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: none
Image Tags: none
Unique Identification: Pyrite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400x
Submitted by: Amy Myrbo
Notes: filling-diatom
Image Tags: none
Unique Identification: Pyrite
Site name: not specified
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Guy Rothwell
Notes: pyrityohedra zeolites
Image Tags: none
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
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
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
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
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
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
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
Unique Identification: Pyrite
Site name: Malawi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: AM
Notes: none
Image Tags: diatom
Unique Identification: Pyrite
Site name: Green Pepper Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Mark Shapley
Notes: none
Image Tags: none
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
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
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
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