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Id 46
Identification Type Mineral
Name Gypsum
Distinguishing Features Low-relief
Low-birefringence
Tabular
Acicular
Description Transparent colorless. Nonpleochroic. Low birefringence (about the same as quartz). May occur as thin plates (folia), tabular euhedra, or acicular needles. Low relief. Detrital or authigenic. Frequently associated with pyrite when authigenic. May be twinned. Caution: common precipitate from pore waters of cores as they age in storage. Also, heating slide may cause polysynthetic twinning.
Tags
External Resources Gypsum on MinDat
Imposters
Images
Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Unique Identification: Gypsum
Site name: Great Salt Lake, UT
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: gypsum, authigenic
Image Tags: none
Unique Identification: Gypsum
Site name: Great Salt Lake, UT
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: gypsum, authigenic
Image Tags: none
Unique Identification: Gypsum
Site name: Miscanti
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: none
Image Tags: none
Unique Identification: Gypsum
Site name: Miscanti
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: Andy Breckenridge
Notes: none
Image Tags: none
Unique Identification: Gypsum
Site name: Peten Itza
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Michael Rosen Blas Valero
Notes: transparent low-birefringent monoclinic euhedral
Image Tags: none
Unique Identification: Gypsum
Site name: Peten Itza
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Michael Rosen Blas Valero
Notes: transparent low-birefringent monoclinic euhedral
Image Tags: none
Unique Identification: Gypsum
Site name: Atacama
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Michael Rosen Blas Valero
Notes: transparent, carbonate inclusions, euhedral
Image Tags: none
Unique Identification: Gypsum
Site name: Atacama
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Michael Rosen Blas Valero
Notes: transparent, carbonate inclusions, euhedral
Image Tags: none
Unique Identification: Gypsum
Site name: Peten Itza
Light type: Plane-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: carbonate inclusions, transparent low-birefringent monoclinic euhedral
Image Tags: none
Unique Identification: Gypsum
Site name: Peten Itza
Light type: Cross-Polarized Light
Magnification: 630
Submitted by: Michael Rosen Blas Valero
Notes: carbonate inclusions, transparent low-birefringent monoclinic euhedral
Image Tags: none
Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Unique Identification: Gypsum
Site name: Hurleg Lake
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: rutilated
Unique Identification: Gypsum
Site name: Miscanti
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Blas Valero
Notes: transparent low-birefringent monoclinic euhedral corroded
Image Tags: none
Unique Identification: Gypsum
Site name: Miscanti
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Blas Valero
Notes: transparent low-birefringent monoclinic euhedral corroded
Image Tags: none