mineral

Satin Spar Selenite

Gypsum (CaSO4·2H2O)

AI-generated identification · may be incorrect

Hardness: 2 (Mohs); Color: White, translucent; Luster: Pearly to silky; Crystal structure: Monoclinic; Cleavage: Perfect; Specific gravity: 2.3

Hardness: 2 (Mohs)
Color: White, translucent
Luster: Pearly to silky

Identified July 11, 2026More mineral →

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Physical properties

Hardness: 2 (Mohs); Color: White, translucent; Luster: Pearly to silky; Crystal structure: Monoclinic; Cleavage: Perfect; Specific gravity: 2.3

Formation & geological history

An evaporite mineral formed in alkaline lake muds, clay beds, or through the evaporation of seawater in sedimentary environments.

Uses & applications

Used in plaster, drywall, and fertilizer; commonly sold as decorative items, wands, and metaphysical healing stones.

Geological facts

While commonly called 'Selenite' in the trade, this fibrous variety is technically 'Satin Spar'. True Selenite is transparent and platy. It is so soft it can be scratched with a fingernail.

Field identification & locations

Identify by its silky, fibrous appearance and extreme softness. Common in Morocco, Mexico, and the USA. Beware: it can dissolve if left in water for long periods.