mineral
Likely gypsum (selenite/alabaster), possibly a weathered evaporite fragment
Gypsum, CaSO₄·2H₂O
AI-generated identification · may be incorrectCream-white, dull to pearly, with a soft, layered or fibrous texture; gypsum has Mohs hardness 2, monoclinic crystals, and good cleavage. The photo alone cannot confirm the identification.
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Physical properties
Cream-white, dull to pearly, with a soft, layered or fibrous texture; gypsum has Mohs hardness 2, monoclinic crystals, and good cleavage. The photo alone cannot confirm the identification.
Formation & geological history
Forms when sulfate-rich water evaporates in sedimentary basins, or through hydration of anhydrite; deposits range from geologically recent to hundreds of millions of years old.
Uses & applications
Gypsum is used to make plaster, drywall, and cement; clear selenite and attractive gypsum specimens are collected and sometimes carved.
Geological facts
Gypsum is soft enough to scratch with a fingernail and may leave a white powder streak.
Field identification & locations
Check for softness and a white streak; gypsum commonly occurs in evaporite beds and caves. The specimen’s irregular, coated appearance makes visual identification uncertain.
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Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral