mineral

Tumbled Moonstone

Feldspar (Orthoclase/Albite), KAlSi3O8

Hardness: 6.0-6.5 Mohs; Color: White, cream, with pearly adularescence; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in two directions.

Hardness: 6
Color: White, cream, with pearly adularescence
Luster: Vitreous to pearly

Identified May 9, 2026More mineral →

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Physical properties

Hardness: 6.0-6.5 Mohs; Color: White, cream, with pearly adularescence; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in two directions.

Formation & geological history

Formed in igneous and metamorphic environments, specifically in pegmatites. The characteristic sheen is caused by the alternating layers of orthoclase and albite as the mineral cools.

Uses & applications

Primarily used as a gemstone in jewelry, ornamental carvings, and by crystal collectors for its aesthetic and perceived metaphysical properties.

Geological facts

The unique play of light is called adularescence, which mimics the glow of the moon. It was a popular stone during the Art Nouveau period and is the birthstone for June.

Field identification & locations

Identify by its soft pearly luster and light play. It is commonly found in Sri Lanka, India, Madagascar, and Myanmar. Field identification focuses on the internal glow and orthogonal cleavage angles.

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