mineral
Satin Spar Selenite
Satin Spar (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Mohs hardness of 2 (can be scratched by a fingernail), white to pearly color, silky or satiny luster, monoclinic crystal system, fibrous structure, specific gravity of 2.3.
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Physical properties
Mohs hardness of 2 (can be scratched by a fingernail), white to pearly color, silky or satiny luster, monoclinic crystal system, fibrous structure, specific gravity of 2.3.
Formation & geological history
Formed as an evaporite mineral in sedimentary environments where saline water evaporates, primarily from ancient seas and salt lakes during various geological eras such as the Permian or Triassic.
Uses & applications
Commonly used for ornamental carvings, decorative home decor, metaphysical energy healing, and as a source for gypsum in plaster and drywall production.
Geological facts
Satin spar is often mistaken for true Selenite (transparent plate-like crystals) or Desert Rose. It is a fibrous variety of gypsum that exhibits chatoyancy (a cat-eye effect) when polished.
Field identification & locations
Identify by its softness (scratchable with a thumbnail) and its distinct fibrous, parallel crystal growth. Common locations include Morocco, Mexico, and the United States (Utah/New Mexico).
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