mineral

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Hardness: 6-6.5 (Mohs scale), Color: Peach, salmon, or peach-orange, Luster: Vitreous to pearly, Crystal structure: Monoclinic, Cleavage: Two directions at 90 degrees, Specific gravity: 2.56-2.59

Hardness: 6-6

Identified May 31, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs scale), Color: Peach, salmon, or peach-orange, Luster: Vitreous to pearly, Crystal structure: Monoclinic, Cleavage: Two directions at 90 degrees, Specific gravity: 2.56-2.59

Formation & geological history

Formed through the cooling of acidic magma and the subsequent exsolution of orthoclase and albite layers in a lamellar structure, which creates the characteristic schiller effect.

Uses & applications

Primarily used in jewelry making, ornamental carvings, and by crystal collectors for its aesthetic and metaphysical properties.

Geological facts

The peach hue is typically caused by inclusions of hematite (iron oxide). It is part of the feldspar group, which is the most abundant mineral group in Earth's crust.

Field identification & locations

Identified by its distinctive schiller or adularescence (a glow beneath the surface). Commonly found in Sri Lanka, India, and Madagascar. In the field, look for its perfect right-angle cleavage and pearly sheen on fractures.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

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

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

metamorphic

Green Apatite on Albite

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

mineral