mineral
Moonstone
Orthoclase feldspar (KAlSi3O8)
AI-generated identification · may be incorrectMohs hardness 6, white to translucent color with pearly adularescence, monoclinic crystal system, good cleavage.
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Physical properties
Mohs hardness 6, white to translucent color with pearly adularescence, monoclinic crystal system, good cleavage.
Formation & geological history
Forms through the exsolution of alternating albite and orthoclase lamellae in cooling igneous and metamorphic pegmatites.
Uses & applications
Widely used in gemstone jewelry, cabochons, beads, and metaphysical crystal collecting.
Geological facts
Moonstone exhibits a shimmering optical phenomenon called adularescence caused by light scattering between microscopic mineral layers.
Field identification & locations
Identified by its signature floating blue or white light sheen; found in Sri Lanka, India, Madagascar, and the US.
