gemstone
Moonstone
Orthoclase feldspar (KAlSi3O8)
AI-generated identification · may be incorrectMohs hardness 6-6.5, white to bluish adularescence, vitreous luster, monoclinic crystal system, specific gravity 2.56-2.58.
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Physical properties
Mohs hardness 6-6.5, white to bluish adularescence, vitreous luster, monoclinic crystal system, specific gravity 2.56-2.58.
Formation & geological history
Forms in igneous rocks like pegmatites and granites as cooling magma crystallizes, as well as in metamorphic environments.
Uses & applications
Widely used in jewelry such as rings, pendants, and earrings, and valued by crystal collectors.
Geological facts
Moonstone exhibits adularescence, a unique optical phenomenon caused by light scattering between microscopic alternating layers of orthoclase and albite.
Field identification & locations
Identified by its signature floating blue or white sheen moving across the surface when rotated under light; commonly sourced from Sri Lanka, India, and Madagascar.
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