mineral

Pink selenite (gypsum)

Gypsum, CaSO₄·2H₂O

AI-generated identification · may be incorrect

Likely a small rounded, satin-spar/selenite fragment; pale salmon-pink with a pearly to silky luster and fibrous or striated surface. Gypsum has Mohs hardness 2, monoclinic crystals, and perfect cleavage in one direction; the color may come from trace impurities or treatment.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Gypsum forms when sulfate-rich water evaporates in sedimentary basins, or through hydration of anhydrite. Deposits range from recent evaporites to rocks hundreds of millions of years old.

Uses & applications

Gypsum is used in drywall, plaster, and cement; clear or attractive specimens are collected and sometimes carved or polished.

Geological facts

Gypsum is soft enough to be scratched by a fingernail and can be shaped easily; selenite is a transparent-to-translucent crystalline variety.

Field identification & locations

Check that a fingernail scratches it readily and that the surface shows silky fibrous striations; this image alone cannot confirm the pink color is natural. Common sources include evaporite deposits in Mexico, the United States, and North Africa.