gemstone
Moonstone
Orthoclase feldspar (KAlSi3O8)
AI-generated identification · may be incorrectMohs hardness of 6-6.5, pearly to vitreous luster, white to translucent body color with characteristic blue or white adularescence, monoclinic crystal system.
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Physical properties
Mohs hardness of 6-6.5, pearly to vitreous luster, white to translucent body color with characteristic blue or white adularescence, monoclinic crystal system.
Formation & geological history
Forms in igneous rocks like granitic pegmatites and metamorphic environments through the cooling and exsolution of alkali feldspars.
Uses & applications
Widely used in jewelry such as rings, pendants, and earrings, as well as valued by collectors and crystal enthusiasts.
Geological facts
Moonstone displays a floating shimmer of light called adularescence caused by microscopic lamellae intergrowths. It holds significant cultural and historical symbolism tied to lunar deities.
Field identification & locations
Identified by its signature optical phenomenon and cleavage planes, commonly sourced from Sri Lanka, India, Madagascar, and Myanmar.
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