mineral
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
Hardness: 2 on the Mohs scale, Color: White to translucent with a pearly or silky sheen, Luster: Silky to pearly, Crystal structure: Monoclinic, Cleavage: Perfect in one direction, Specific gravity: 2.3
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Physical properties
Hardness: 2 on the Mohs scale, Color: White to translucent with a pearly or silky sheen, Luster: Silky to pearly, Crystal structure: Monoclinic, Cleavage: Perfect in one direction, Specific gravity: 2.3
Formation & geological history
Formed as an evaporite mineral in sedimentary environments, typically from the evaporation of sulfate-rich water in ancient seas or salt lakes.
Uses & applications
Commonly used in holistic healing, decorative carvings, lamps, and polished display pieces. Gypsum is also widely used in drywall, plaster, and cement manufacturing.
Geological facts
Satin spar is a fibrous variety of gypsum that exhibits chatoyancy, a cat-eye effect caused by light reflecting off parallel fibers.
Field identification & locations
Easily identified by its very low hardness (can be easily scratched with a fingernail) and fibrous, silky appearance. Found worldwide, particularly in large deposits in Mexico, Morocco, and the USA.
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