mineral
Selenite
Gypsum (CaSO4·2H2O)
Hardness: 2 on the Mohs scale, Color: Transparent to translucent white, Luster: Vitreous to pearly or silky, Crystal structure: Monoclinic, Cleavage: Perfect tabular cleavage, Specific gravity: 2.3
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Physical properties
Hardness: 2 on the Mohs scale, Color: Transparent to translucent white, Luster: Vitreous to pearly or silky, Crystal structure: Monoclinic, Cleavage: Perfect tabular cleavage, Specific gravity: 2.3
Formation & geological history
Formed as an evaporite mineral from the precipitation of calcium sulfate-rich waters in ancient basins, salt flats, and marine environments.
Uses & applications
Widely used in ornamental carvings, crystal healing, decorative lamps, and occasionally in plaster of Paris manufacture.
Geological facts
Selenite is named after the Greek goddess of the moon, Selene, because of its soft, moon-like glow. It is famously found in giant crystal forms at the Naica Mine in Mexico.
Field identification & locations
Easily identified by its very low hardness (can be scratched with a fingernail) and fibrous or transparent crystal habit. Commonly sourced from Mexico, Morocco, and the USA.
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