gemstone
Moonstone
Orthoclase feldspar (KAlSi3O8)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, pearly to vitreous luster, and monoclinic crystal system. It exhibits a distinctive optical phenomenon called adularescence, appearing as a shimmering blue or white light floating across the surface.
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Physical properties
Hardness of 6 on the Mohs scale, pearly to vitreous luster, and monoclinic crystal system. It exhibits a distinctive optical phenomenon called adularescence, appearing as a shimmering blue or white light floating across the surface.
Formation & geological history
Forms in igneous rocks like pegmatites and granites, as well as in hydrothermal veins, cooling slowly to allow the exsolution of alternating albite and orthoclase lamellae.
Uses & applications
Widely used in jewelry-making for cabochon rings, earrings, and pendants, and treasured by gemstone collectors.
Geological facts
Moonstone was historically associated with lunar deities and gained immense popularity during the Art Nouveau period. Its optical glow is caused by light scattering between microscopic layers of different feldspars.
Field identification & locations
Identified by its characteristic adularescence and white-to-gray body color. Commonly sourced from Sri Lanka, India, Madagascar, and Myanmar.
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