mineral
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
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
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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.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock