Satin Spar Selenite
Gypsum var. Satin Spar · Decorative Stone and Mineral Specimen
Crystal System
Monoclinic; fibrous habit, often carved into decorative objects
Mineral Group
Sulfates
Chemical Formula
CaSO4·2H2O
Formation Process
Sedimentary formation through the evaporation of sulfate-rich saline waters in shallow marine basins or salt lakes under arid conditions
About This Crystal
The central carved figurine and associated flat base and mushrooms exhibit a milky white to translucent appearance with a characteristic silky luster, displaying fibrous parallel structures that catch the light
Physical Characteristics
White to colorless body color, white streak, perfect cleavage in one direction, fibrous fracture, specific gravity of approximately 2.30, very soft and brittle, and may exhibit weak fluorescence under UV light
Optical Properties
Biaxial positive with low birefringence and a fibrous chatoyant effect known as satin-sparring, showing a silky sheen along the length of the fibers
Hardness & Durability
Origin Region
Morocco, Mexico, USA, and Poland; typically forms in evaporite sedimentary environments
Hardness & Durability
Mohs hardness of 2, making it extremely soft and easily scratched by a fingernail; very low durability and poor suitability for daily-wear jewelry
Care & Maintenance
Extremely water-soluble and must never be cleaned with water; clean using a dry cloth only, store away from moisture, humidity, and direct sunlight
Rarity & Value
Very common and widely available, highly affordable for decorative carvings, polished shapes, and mass-market mineral specimens
Special Characteristics
Fibrous structure producing chatoyancy (silky sheen), extremely soft texture, and high water solubility
Lore & History
Named after the Greek goddess of the moon, Selene; traditionally used in modern metaphysical practices for energetic cleansing, clearing spaces, and aligning the crown chakra, though these remain traditional beliefs rather than scientific claims