Sanidine vs Peridot
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Sanidine
Sanidine is the high-temperature form of potassium feldspar, with a composition close to KAlSi3O8 and a monoclinic crystal structure. It is commonly found in potassium-rich volcanic rocks such as rhyolite and other rocks that crystallized or equilibrated at high temperature; its rapid cooling can preserve the disordered arrangement that distinguishes it from microcline and orthoclase. Clear, glass...
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Peridot
Peridot is the gem-quality form of olivine, a mineral whose green color comes mainly from iron in its crystal structure. Unlike many gemstones, its color is intrinsic to the material rather than primarily caused by trace impurities. Peridot occurs in igneous rocks and has also been identified in some meteorites; important sources include Arizona, Pakistan, Myanmar, and the Red Sea island of Zabarg...
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