Peach Selenite
Gypsum var. Selenite (Satin Spar) · Decorative Stone / Mineral Specimen
Crystal System
Monoclinic; commonly occurs in fibrous, parallel growth habits known as Satin Spar.
Mineral Group
Sulfates (Hydrated)
Chemical Formula
CaSO4·2H2O (Hydrous Calcium Sulfate) with trace amounts of Hematite (Fe2O3)
Formation Process
Sedimentary process; formed by the evaporation of saline water in dry lake beds (evaporites) under low temperature and pressure conditions.
About This Crystal
A peach to apricot colored, translucent specimen with a distinct pearly to silky luster. It features a fibrous internal structure that creates a chatoyant 'shimmer' when light hits the surface. This specific piece shows white linear banding and a small dark inclusion of host rock or manganese.
Physical Characteristics
Color: Peach/Orange; Streak: White; Cleavage: Perfect in one direction; Fracture: Splintery; Specific Gravity: 2.3; Fluorescence: Can show pale blue or white under UV light.
Optical Properties
Biaxial (+); Refractive Index: 1.520–1.530; Birefringence: 0.009; Exhibits silky chatoyancy due to its parallel fibrous structure.
Hardness & Durability
Origin Region
Morocco (Sahara Desert), Mexico, and Utah, USA. Formed in evaporated prehistoric lake beds and marine basins.
Hardness & Durability
Mohs Hardness: 2. Very soft and can be scratched by a fingernail. Poor toughness; brittle and prone to breakage along cleavage planes.
Care & Maintenance
Avoid all water exposure as it is water-soluble; clean only with a dry soft cloth. Store separately from harder stones to prevent scratches. Keep away from heat and direct sunlight.
Rarity & Value
Common and highly affordable. Value is determined by color saturation and the presence of high-quality chatoyancy (shimmer).
Special Characteristics
Exhibits strong chatoyancy (cat's eye effect) across its fibrous surface. It is one of the softest minerals and is highly susceptible to acids and moisture.
Lore & History
Named after the Greek moon goddess 'Selene.' Historically used in windowpanes before glass was common. In crystal lore, it is believed to assist with emotional cleansing, the sacral chakra, and removing stagnant energy.