mineral

Peach Moonstone

Orthoclase (Potassium Aluminum Silicate), KAlSi3O8

Hardness: 6.0-6.5 Mohs. Color: Peach, salmon, orange-tan. Luster: Vitreous to pearly with an adularescent glow. Crystal structure: Monoclinic, often appearing as orthoclase feldspar with internal layering. Specific gravity: 2.55-2.63.

Hardness: 6
Color: Peach, salmon, orange-tan
Luster: Vitreous to pearly with an adularescent glow

Identified February 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling and slow crystallization of igneous magma. Its distinctive sheen, called adularescence, is caused by the intergrowth of two different types of feldspar (orthoclase and albite) that separate and form alternating layers as the mineral cools.

Uses & applications

Primarily used in jewelry (cabochons, beads, rings), as a gemstone for collectors, and in metaphysical practices where it is associated with emotional healing and intuition.

Geological facts

Peach moonstone is a variety of the mineral orthoclase. The shimmer effect is caused by light scattering between microscopic layers of feldspar within the stone. Moonstone was highly popular during the Art Nouveau period, frequently used by the famous jeweler René Lalique.

Field identification & locations

Identify in the field by its distinctive 'schiller' or billowy glow when rotated under light, combined with its 90-degree cleavage planes. Found mostly in Sri Lanka, India, Myanmar, and Madagascar. For collectors, look for uniform color and strong adularescence.

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