mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
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.
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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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