gemstone
Moonstone
Orthoclase feldspar, (K,Na)AlSi3O8
AI-generated identification · may be incorrectMohs hardness 6 to 6.5. White to translucent with a characteristic blue or silvery adularescence. Vitreous to pearly luster with monoclinic crystal system.
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Physical properties
Mohs hardness 6 to 6.5. White to translucent with a characteristic blue or silvery adularescence. Vitreous to pearly luster with monoclinic crystal system.
Formation & geological history
Formed through the exsolution of alternating microscopic layers of albite and orthoclase within cooling igneous rocks like pegmatites.
Uses & applications
Widely used as a gemstone in rings, necklaces, and earrings, and valued as an ornamental stone.
Geological facts
The distinctive floating blue light effect, known as adularescence, is caused by light scattering between thin feldspar layers.
Field identification & locations
Identified visually by its shimmering internal blue light. Major sources include Sri Lanka, India, Madagascar, and Myanmar.
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