mineral
Satin Spar (often sold as Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Hardness: 2 on Mohs scale (can be scratched by a fingernail). Color: Pearly white, translucent. Luster: Silky or pearly. Crystal structure: Monoclinic, typically fibrous. Cleavage: Perfect in one direction.
- Hardness
- 2 on Mohs scale (can be scratched by a fingernail)
- Color
- Pearly white, translucent
- Luster
- Silky or pearly
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Physical properties
Hardness: 2 on Mohs scale (can be scratched by a fingernail). Color: Pearly white, translucent. Luster: Silky or pearly. Crystal structure: Monoclinic, typically fibrous. Cleavage: Perfect in one direction.
Formation & geological history
Formed as an evaporite mineral in sedimentary environments, often where seawater has evaporated or in clay beds and caves.
Uses & applications
Used primarily for ornamental purposes, carving, decorative lamps, and by collectors. Industrial gypsum is used in drywall and plaster.
Geological facts
While commonly called 'Selenite' in the metaphysical community, this fibrous variety is scientifically 'Satin Spar'. True Selenite is transparent and forms flat, window-like plates.
Field identification & locations
Identified by its intense silky luster and its softness; it is one of the few minerals easily scratched by a fingernail. Commonly found in Morocco, Mexico, and the USA.
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Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
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