mineral
Moonstone
Orthoclase Feldspar (KAlSi3O8) with inclusions of Albite
Hardness: 6.0-6.5 Mohs; Color: White, cream, or translucent with blue/white sheen; Luster: Vitreous to Pearly; Crystal Structure: Monoclinic; Specific Gravity: 2.56-2.59
- Hardness
- 6
- Color
- White, cream, or translucent with blue/white sheen
- Luster
- Vitreous to Pearly
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Physical properties
Hardness: 6.0-6.5 Mohs; Color: White, cream, or translucent with blue/white sheen; Luster: Vitreous to Pearly; Crystal Structure: Monoclinic; Specific Gravity: 2.56-2.59
Formation & geological history
Formed in igneous and metamorphic rocks when orthoclase and albite feldspar layers intergrow. As the magma cools, the two minerals separate into stacked layers, causing adularescence.
Uses & applications
Primarily used in jewelry for cabochons and beads, as well as valued as a healing stone in spiritual and metaphysical circles.
Geological facts
Moonstone is famous for 'adularescence,' an optical phenomenon that creates a billowy blue or white light appearing to glide across the surface. It is the state gem of Florida to commemorate the Apollo moon landings.
Field identification & locations
Identified by its characteristic shimmer (adularescence) when rotated under light. Commonly found in Sri Lanka, India, Myanmar, and Madagascar. Look for the 'shiller' effect in tumbled river stones or pegmatite veins.
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