mineral

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Hardness: 6-6.5 Mohs; Color: Peach, salmon, or orange-beige; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Specific gravity: 2.56-2.58; Features adularescence (a glowing sheen).

Hardness: 6-6
Color: Peach, salmon, or orange-beige
Luster: Vitreous to pearly

Identified April 27, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Peach, salmon, or orange-beige; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Specific gravity: 2.56-2.58; Features adularescence (a glowing sheen).

Formation & geological history

Formed in igneous and metamorphic rocks when cooling magma allows feldspar layers to separate (exsolution), creating the structure that scatters light. Often found in pegmatites.

Uses & applications

Primarily used in jewelry (cabochons, beads, rings), ornamental carvings, and as a popular specimen for crystal healing and mineral collecting.

Geological facts

The 'glow' associated with moonstone is called adularescence, which is caused by the interference of light reflecting off internal structures of albite and orthoclase feldspar.

Field identification & locations

Identify in the field by its distinct pearly luster and the way light seems to move across the surface when tilted. Commonly found in Madagascar, Sri Lanka, and India.