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Inorganics

Id Identification Type Name Description Distinguishing Features Tags
33 Mineral Garnet Transparent colorless to rose or amber. Isotropic. Very high relief. Equant rounded grains are most common, but may also occur as etched and irregular grains. Cleavage absent. Occurs as smaller grains than other minerals in slide because of garnet's higher density. Isotropic
Heavy-mineral
pink
brown
silicate
174 Lithofacies Glacial varves
15 Mineral Glauconite Blue green to olive green. Often occurs as sand-sized, rounded pellets. Secondary mineral. green
159 Mineral Greigite
46 Mineral Gypsum 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. Low-relief
Low-birefringence
Tabular
Acicular