mineral

Green Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Hardness: 6-6.5 on Mohs scale; Color: Pale mint green to sage; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.56-2.59

Hardness: 6-6
Color: Pale mint green to sage
Luster: Vitreous to pearly

Identified March 24, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale mint green to sage; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.56-2.59

Formation & geological history

Formed in plutonic igneous rocks (granite and syenite pegmatites) through slow cooling. The characteristic 'adularescence' (light glow) comes from the alternating micro-layers of orthoclase and albite feldspar that scatter light.

Uses & applications

Primarily used in jewelry (rings, pendants, and cabochons) and as a decorative stone in metaphysical collections and crystal healing.

Geological facts

Green moonstone is sometimes called 'Garnierite' erroneously, though it is actually a variety of Orthoclase feldspar. It is associated with the zodiac sign Cancer and is often linked to calming emotional stress.

Field identification & locations

Identify in the field by its semi-translucent appearance and the 'shimmer' that appears just beneath the surface when rotated under light. Found commonly in India, Sri Lanka, Madagascar, and Tanzania.

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Arenite (SiO2 based)

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Banded Gneiss (River Rock/Pebble)

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Green Apatite on Albite

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

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