mineral
Likely tumbled moonstone
Feldspar, probably orthoclase or plagioclase; composition varies
AI-generated identification · may be incorrectSmall polished gray-white stone with a glassy sheen; moonstone has Mohs hardness 6–6.5 and a feldspar crystal structure. The photo is too distant to confirm its characteristic blue or white adularescence or cleavage.
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Physical properties
Small polished gray-white stone with a glassy sheen; moonstone has Mohs hardness 6–6.5 and a feldspar crystal structure. The photo is too distant to confirm its characteristic blue or white adularescence or cleavage.
Formation & geological history
Feldspar crystallizes in igneous and metamorphic rocks; moonstone’s shimmer comes from microscopic feldspar layers. Its geological age depends on its source deposit.
Uses & applications
Cut and polished for jewelry and collectibles; feldspar is also used in ceramics and glassmaking.
Geological facts
Moonstone’s optical glow, called adularescence, moves across the surface as the stone is turned.
Field identification & locations
Look for a floating sheen that shifts with viewing angle and test hardness only on an inconspicuous area. Moonstone is mined in places including Sri Lanka, India, Madagascar, and Myanmar.
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