mineral
White selenite (gypsum)
Gypsum, CaSO₄·2H₂O; selenite is its crystalline variety
AI-generated identification · may be incorrectWhite to colorless, translucent, with a pearly or silky luster and monoclinic crystals; Mohs hardness 2, so it can be scratched by a fingernail. The specimen appears cloudy and roughly shaped, though the image alone cannot confirm its identity.
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Physical properties
White to colorless, translucent, with a pearly or silky luster and monoclinic crystals; Mohs hardness 2, so it can be scratched by a fingernail. The specimen appears cloudy and roughly shaped, though the image alone cannot confirm its identity.
Formation & geological history
Gypsum forms when sulfate-rich water evaporates in sedimentary basins, and also occurs in caves and hydrothermal settings. It is found in rocks of many ages; the pictured specimen’s age and locality cannot be determined visually.
Uses & applications
Used to make plaster, drywall, and cement; clear selenite is collected and sometimes carved into ornaments. It is too soft for most jewelry.
Geological facts
Gypsum contains water in its crystal structure and can be scratched with a fingernail.
Field identification & locations
Look for softness, a white streak, and distinctive cleavage; gypsum commonly occurs in evaporite deposits worldwide. The image’s stylized presentation limits reliable visual identification.
