Gypsum Greer County, Oklahoma, USA Dimensions: 3.6 × 3.0 × 2.0 cm Provenance: Older collection specimen; original catalog label No. 312 included.
White to creamy-white massive Gypsum forms a compact specimen with a softly crystalline, satiny texture and subtle pearly luster. Fine interlocking crystals are visible across the surface, giving the otherwise massive material a delicate sparkle.
Gypsum is a hydrated calcium sulfate mineral commonly formed in evaporite deposits as mineral-rich waters evaporate. Oklahoma contains extensive Permian-age gypsum deposits, particularly across the western portion of the state.
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