mineral

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8); variety of Orthoclase Feldspar

Hardness: 6.0-6.5 on Mohs scale; Color: Peach, salmon, or pinkish-tan; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in two directions; Adularescence (schiller effect) is a key feature.

Hardness: 6
Color: Peach, salmon, or pinkish-tan
Luster: Vitreous to pearly

Identified April 16, 2026More mineral →

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Physical properties

Formation & geological history

Formed in plutonic and metamorphic rocks. The unique visual effect (adularescence) is caused by the intergrowth of two types of feldspar (orthoclase and albite) with different refractive indices that separate as the magma cools.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons, beads, rings) and as a lapidary material for decorative carvings or as a collector's specimen.

Geological facts

Ancient Romans and Greeks associated moonstone with lunar deities. The peach variety is highly sought after in modern jewelry for its warm, skin-tone matching hues and soft pearly glow.

Field identification & locations

Identify by its soft peach color and its characteristic 'inner glow' or adularescence that moves across the surface. Commonly found in Sri Lanka, India, Myanmar, and Madagascar.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral