mineral
Selenite (gypsum) wand
Gypsum, CaSO₄·2H₂O; fibrous variety commonly called satin spar
AI-generated identification · may be incorrectTypically colorless to milky white, translucent, with a silky or pearly luster and fibrous crystal structure; Mohs hardness 2, perfect cleavage, and specific gravity about 2.3. The elongated, rounded shape appears polished or naturally terminated.
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Physical properties
Typically colorless to milky white, translucent, with a silky or pearly luster and fibrous crystal structure; Mohs hardness 2, perfect cleavage, and specific gravity about 2.3. The elongated, rounded shape appears polished or naturally terminated.
Formation & geological history
Forms when evaporating saline water precipitates calcium sulfate, commonly in sedimentary evaporite beds; many specimens are geologically young, though gypsum deposits range from recent to hundreds of millions of years old.
Uses & applications
Used for plaster, drywall, cement, and soil amendment; attractive wands are sold for mineral collecting, décor, and metaphysical markets, though they are too soft for durable jewelry.
Geological facts
Selenite is transparent gypsum, while satin spar is the fibrous form; the names are often used interchangeably in shops. It readily scratches with a fingernail and can be damaged or dissolved by prolonged moisture.
Field identification & locations
Common localities include Morocco, Mexico, the United States, Spain, and Australia. Identify it by its very low hardness, white translucency, fibrous sheen, and lack of fizzing in dilute acid; avoid water and abrasion.
