mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
AI-generated identification · may be incorrectMohs hardness of 2, white to translucent color, silky to pearly luster, monoclinic crystal system, perfect cleavage in one direction, specific gravity around 2.3.
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Physical properties
Mohs hardness of 2, white to translucent color, silky to pearly luster, monoclinic crystal system, perfect cleavage in one direction, specific gravity around 2.3.
Formation & geological history
Formed as an evaporite mineral from the evaporation of sulfate-rich water in ancient seas and lakes, often found in sedimentary rock sequences.
Uses & applications
Commonly carved into decorative objects, towers, and spheres for the crystal healing market, and used in the manufacturing of drywall and plaster.
Geological facts
Satin spar is a fibrous variety of gypsum that exhibits a cat's-eye effect (chatoyancy) due to its needle-like crystal structure.
Field identification & locations
Easily identified by its very soft nature (can be scratched with a fingernail) and fibrous, silky appearance. Found worldwide, with major deposits in Mexico, Morocco, and the USA.
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