mineral

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Hardness: 6.0-6.5 on Mohs scale; Color: Peach, salmon, or tan with pearly luster; Crystal structure: Monoclinic; Cleavage: Perfect in two directions; Adularescence effect.

Hardness: 6
Color: Peach, salmon, or tan with pearly luster

Identified January 10, 2026More mineral →

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Physical properties

Hardness: 6.0-6.5 on Mohs scale; Color: Peach, salmon, or tan with pearly luster; Crystal structure: Monoclinic; Cleavage: Perfect in two directions; Adularescence effect.

Formation & geological history

Formed in igneous environments (pegmatites) where cooling magma allows large crystals to form. The peach hue is caused by inclusions of hematite or trace mineral impurities during the crystallization of feldspar layers.

Uses & applications

Primarily used in jewelry for cabochons, beads, and carvings. Also highly valued by collectors and used as a birthstone (June) or in metaphysical practices.

Geological facts

The shimmering light known as adularescence is caused by the intergrowth of two types of feldspar (orthoclase and albite) which scatters light between thin layers. The peach variety is unique for its softer, warm color compared to the white/blue classic moonstone.

Field identification & locations

Identify in the field by its distinct pearly sheen (adularescence) when rotated under light, and its relatively high hardness compared to soft stones like calcite. Found commonly in India, Sri Lanka, and Madagascar.

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