gemstone
Moonstone
Orthoclase feldspar (KAlSi3O8)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, pearly to vitreous luster, white to translucent body color with characteristic adularescence, and monoclinic crystal system.
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Physical properties
Hardness of 6 on the Mohs scale, pearly to vitreous luster, white to translucent body color with characteristic adularescence, and monoclinic crystal system.
Formation & geological history
Forms when molten silicate melts cool slowly within igneous rocks like pegmatites and granites, or through hydrothermal processes.
Uses & applications
Extensively used in fine jewelry such as rings, earrings, and pendants, and collected for its unique optical phenomenon.
Geological facts
Moonstone exhibits adularescence, an optical phenomenon where light scatters across microscopic layers of albite and orthoclase.
Field identification & locations
Identified by its signature floating blue or white sheen when rotated under a light source; commonly sourced from Sri Lanka, India, and Madagascar.
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