gemstone
Moonstone
Orthoclase feldspar, (K,Na)AlSi3O8
AI-generated identification · may be incorrectMoonstone has a hardness of 6 on the Mohs scale, typically white or translucent color with a pearly luster, and exhibits adularescence. It possesses a monoclinic crystal system and two directions of good cleavage.
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Physical properties
Moonstone has a hardness of 6 on the Mohs scale, typically white or translucent color with a pearly luster, and exhibits adularescence. It possesses a monoclinic crystal system and two directions of good cleavage.
Formation & geological history
It forms when molten silicate material cools slowly within igneous rocks like pegmatites and granites, or through the exsolution of intergrown feldspar layers.
Uses & applications
Moonstone is widely used in jewelry making for rings, earrings, and pendants, as well as valued by mineral and crystal collectors.
Geological facts
The shimmering optical effect called adularescence occurs due to light scattering between microscopic alternating layers of orthoclase and albite.
Field identification & locations
Key identification features include its distinctive floating blue or white sheen when rotated under a light source. Major deposits are found in Sri Lanka, India, Madagascar, and Myanmar.
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