mineral
Satin Spar Selenite
Gypsum (Hydrated Calcium Sulfate, CaSO4·2H2O)
AI-generated identification · may be incorrectMohs hardness of 2, white to transparent color with a characteristic pearly to silky luster, monoclinic crystal system, and perfect cleavage in one direction.
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Physical properties
Mohs hardness of 2, white to transparent color with a characteristic pearly to silky luster, monoclinic crystal system, and perfect cleavage in one direction.
Formation & geological history
Formed through the evaporation of ancient saline bodies of water, primarily in sedimentary evaporite deposits.
Uses & applications
Commonly used in decorative carvings, holistic crystal healing, and interior ornaments.
Geological facts
Satin spar is a fibrous variety of gypsum that exhibits a distinct chatoyancy or cat-eye effect when polished.
Field identification & locations
Easily identified by its very soft nature—it can be easily scratched with a fingernail—and its fibrous, silky appearance. It is found worldwide, notably in Mexico, Morocco, and the USA.
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