gemstone
Moonstone
Orthoclase feldspar (KAlSi3O8)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, transparent to translucent with a characteristic pearly adularescence, monoclinic crystal system.
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Physical properties
Hardness 6 on Mohs scale, transparent to translucent with a characteristic pearly adularescence, monoclinic crystal system.
Formation & geological history
Forms when cooling molten rock in igneous environments and hydrothermal veins, often found in pegmatites.
Uses & applications
Widely used in fine jewelry, particularly as cabochons for rings and pendants, and valued by mineral collectors.
Geological facts
Moonstone exhibits a shimmering optical phenomenon called adularescence caused by light scattering between microscopic alternating layers of orthoclase and albite.
Field identification & locations
Identified by its signature floating blue or white sheen; major sources include Sri Lanka, India, Madagascar, and Myanmar.
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