jadeite: see jade jade, common name for either of two minerals used as gems. The rarer variety of jade is jadeite, a sodium aluminum silicate, NaAl(SiO3)2, usually white or green in color; the green variety is the more valuable.
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Gem-quality silicate mineral in the pyroxene family that is one of the two forms of jade. Jadeite (imperial jade), sodium aluminum silicate (NaAlSi2O6), may contain impurities that give it a variety of colours: white, green, red, brown, and blue. The most highly prized variety is emerald green. Jadeite occurs only in metamorphic rocks, most often in those that have been subjected to the high pressures deep below the Earth's surface. The area around the city of Mogaung in northern Myanmar has long been the main source of gem-quality jadeite.
jadeite [′jā‚dīt]
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jadeite
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Uncut (left) and cut jadeite
(credit: Runk/Schoenberger—Grant Heilman)
jadeite [′jā‚dīt]
(mineralogy)
NaAl(SiO3)2A clinopyroxene mineral occurring as green, fibrous monoclinic crystals; the most valuable variety of jade.
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