mineral
Satin Spar (Satin Spar Selenite)
Gypsum (CaSO4·2H2O)
AI-generated identification · may be incorrectHardness: 2 (Mohs scale); Color: White, Pearly; Luster: Silky/Satin-like; Crystal Structure: Monoclinic; Cleavage: Perfect; Specific Gravity: 2.3
- Hardness
- 2 (Mohs scale)
- Color
- White, Pearly
- Luster
- Silky/Satin-like
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Physical properties
Hardness: 2 (Mohs scale); Color: White, Pearly; Luster: Silky/Satin-like; Crystal Structure: Monoclinic; Cleavage: Perfect; Specific Gravity: 2.3
Formation & geological history
Formed as an evaporite mineral in sedimentary environments, specifically from the evaporation of saline waters in prehistoric sea beds or saline lakes.
Uses & applications
Used in plaster, drywall, fertilizer, and widely popular in the metaphysical community and lapidary arts for decorative carvings and lamps.
Geological facts
Satin spar is often confused with 'true' selenite, but it is identified by its fibrous structure that creates a cat's-eye effect (chatoyancy) when turned in the light.
Field identification & locations
Identify by its softness (it can be scratched with a fingernail) and silky fibrous appearance. Common in Morocco, Mexico, and the USA (Utah).
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