mineral
Satin Spar Gypsum (Satin Spar Selenite)
Gypsum (Calcium Sulfate Dihydrate - CaSO4·2H2O)
Hardness: 2 on Mohs scale (can be scratched with a fingernail). Color: White, pearly, fibrous translucent structure. Luster: Silky to pearly. Crystal System: Monoclinic with parallel fibrous growth.
- Hardness
- 2 on Mohs scale (can be scratched with a fingernail)
- Color
- White, pearly, fibrous translucent structure
- Luster
- Silky to pearly
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Physical properties
Hardness: 2 on Mohs scale (can be scratched with a fingernail). Color: White, pearly, fibrous translucent structure. Luster: Silky to pearly. Crystal System: Monoclinic with parallel fibrous growth.
Formation & geological history
Formed as an evaporite mineral in ancient marine basins and salt lakes through the evaporation of saline waters.
Uses & applications
Widely carved into decorative items, candle holders, and towers; used commercially in drywall, plaster of Paris, and soil conditioner.
Geological facts
Trade-named 'Selenite' in the metaphysical industry, though true selenite refers to transparent, tabular gypsum crystals. Satin spar displays fiber-optic properties, conducting light along its parallel fibers.
Field identification & locations
Easily identified by its extreme softness (scratched by a fingernail), silky luster, and distinct parallel fibrous cleavage. Very soft and water-soluble over time.
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