mineral

Peach Selenite / Orange Gypsum

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Hardness: 2 on Mohs scale (can be scratched by a fingernail); Color: Peach, orange, or salmon pink; Luster: Pearly to vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect; Specific Gravity: 2.3

Hardness: 2 on Mohs scale (can be scratched by a fingernail)
Color: Peach, orange, or salmon pink
Luster: Pearly to vitreous

Identified April 9, 2026More mineral →

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Physical properties

Hardness: 2 on Mohs scale (can be scratched by a fingernail); Color: Peach, orange, or salmon pink; Luster: Pearly to vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect; Specific Gravity: 2.3

Formation & geological history

Formed in evaporite deposits where saline water (typically seawater) evaporates in restricted basins. The peach color is caused by the inclusion of hematite or other iron oxides during the crystallization process.

Uses & applications

Primarily used for metaphysical and decorative purposes, such as palm stones or carvings. Industrial gypsum is used for drywall and plaster, though peach varieties are usually reserved for collectors or lapidary use.

Geological facts

Selenite is a variety of the mineral gypsum. It is named after the Greek word 'selene', meaning moon, due to its soft white or translucent glow. It is water-soluble and will slowly dissolve if soaked in water.

Field identification & locations

Identify in the field by its extreme softness (scratches with a fingernail) and its distinctive fibrous or pearly luster. Commonly found in Morocco, Mexico, and the USA (notably Utah and New Mexico).

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