mineral

White Moonstone (Feldspar)

Potassium aluminum silicate (KAlSi3O8)

Hardness: 6-6.5 Mohs; Color: Milky white with pearly luster; Crystal structure: Monoclinic/Triclinic; Specific gravity: 2.56-2.59.

Hardness: 6-6
Color: Milky white with pearly luster

Identified May 3, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Milky white with pearly luster; Crystal structure: Monoclinic/Triclinic; Specific gravity: 2.56-2.59.

Formation & geological history

Formed in igneous and metamorphic rocks from cooling magma. High-quality specimens often come from pegmatites through an unmixing process of orthoclase and albite during cooling.

Uses & applications

Primarily used in jewelry (cabochons, beads) and as a decorative or healing stone in spiritual practices.

Geological facts

The shimmering effect seen in moonstone is called adularescence, caused by light scattering off internal layers of different feldspar minerals. It is the birthstone for June.

Field identification & locations

Identify by its pearly to opalescent luster and hardness (cannot be scratched by a copper penny but can scratch glass). Found in Sri Lanka, India, and Australia.

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

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Metamorphic Rock

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Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

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