gemstone
Moonstone
Orthoclase feldspar (KAlSi3O8)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, typically white or translucent with a pearly adularescence, monoclinic crystal system, and a vitreous to pearly luster.
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Physical properties
Hardness of 6 on the Mohs scale, typically white or translucent with a pearly adularescence, monoclinic crystal system, and a vitreous to pearly luster.
Formation & geological history
Forms in igneous rocks like pegmatites and granites, as well as in hydrothermal veins, through the cooling and exsolution of alternating feldspar layers.
Uses & applications
Extensively used in jewelry making for cabochons, rings, and pendants, and prized by crystal collectors for its optical phenomena.
Geological facts
Moonstone gets its signature shimmering light effect, called adularescence, from light scattering between microscopic layers of albite and orthoclase.
Field identification & locations
Readily identified by its floating blue or white light sheen when rotated under a light source, commonly mined in Sri Lanka, India, and Madagascar.
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