Gypsum Grand Rapids, Kent County, Michigan, USA Dimensions: 4.0 × 3.0 × 1.2 cm Provenance: Older collection specimen; original catalog label No. 311 included.
A translucent to colorless specimen of Gypsum displaying broad, satiny cleavage surfaces and fine parallel striations. The specimen has a soft pearly to vitreous luster with areas of exceptional translucency characteristic of crystalline Gypsum.
Gypsum is a hydrated calcium sulfate mineral and an important evaporite mineral, forming where mineral-rich waters evaporate and leave extensive sulfate deposits.
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