mineral

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Hardness: 6-6.5; Color: Peach, salmon, or tan with a characteristic milky adularescence; Luster: Vitreous to pearly; Crystal Structure: Monoclinic; Cleavage: Two directions at 90 degrees; Specific Gravity: 2.56-2.59.

Hardness: 6-6
Luster: Vitreous to pearly

Identified January 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous and metamorphic rocks, specifically in pegmatites and deep-seated plutonic rocks. The unique schiller effect (adularescence) is caused by the intergrowth of two types of feldspar (orthoclase and albite) that separate as the magma cools.

Uses & applications

Primarily used in jewelry for cabochons, beads, and carvings. It is also a popular specimen for crystal collectors and is often used in decorative items.

Geological facts

Ancient Romans and Greeks associated moonstone with their lunar deities. The 'peach' variety is a modern favorite in jewelry due to its warmer, more skin-tone-compatible hue compared to the traditional blue-flash moonstone.

Field identification & locations

Identify in the field by its distinct pearly sheen that moves across the surface when tilted. It is commonly found in Sri Lanka, India, Myanmar (Burma), and Madagascar. Collectors should look for even color distribution and a strong 'glow' or shimmer.