mineral

Peach Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Hardness: 2 on Mohs scale; Color: Peach, salmon, orange-pink; Luster: Pearly to silky (Satin Spar); Crystal Structure: Monoclinic; Cleavage: Perfect; Specific Gravity: 2.3

Hardness: 2 on Mohs scale
Color: Peach, salmon, orange-pink
Luster: Pearly to silky (Satin Spar)

Identified June 4, 2026More mineral →

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Physical properties

Hardness: 2 on Mohs scale; Color: Peach, salmon, orange-pink; Luster: Pearly to silky (Satin Spar); Crystal Structure: Monoclinic; Cleavage: Perfect; Specific Gravity: 2.3

Formation & geological history

Formed in ancient evaporative lake beds and marine environments as seawater evaporated, leaving behind concentrated calcium sulfate. The peach color is caused by the inclusion of iron oxide (hematite) during formation.

Uses & applications

Commonly used for ornamental jewelry, spiritual/healing practices, and collection. Industrial gypsum is used in drywall and plaster.

Geological facts

Selenite is named after the Greek word 'selene', meaning moon, due to its soft glow. This specific chatoyant variety is often called 'Satin Spar' because of its fibrous texture. It is one of the softest minerals and can be scratched with a fingernail.

Field identification & locations

Identify by its characteristic silky luster and 'cat's eye' (chatoyant) band of light. It feels warm to the touch and is significantly lighter than quartz. Common locations include Morocco, Mexico, and the USA (Utah/Arizona).