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Keyite
Keyite is a mineral with the chemical formula (As)6 · 2O.〔Fleischer, M., Cabri, L.J., and Pabst, A. (1977) New Mineral Names. American Mineralogist, 62, 1259.〕 The name comes from Charles Locke Key (born 1935), an American mineral dealer who furnished its first specimens.〔Cooper, M.A. and Hawthorne, F.C. (1996) The crystal structure of keyite, (As)6(O)2, an oxysalt mineral with essential cadmium. Canadian Mineralogist, 34, 623-630.〕
Keyite is monoclinic-prismatic, meaning its crystal form has three unequal axes, two of which have 90° angles between them and one with an angle less than 90°.〔Cooper, M.A. and Hawthorne, F.C. (1996) The crystal structure of keyite, (As)6(O)2, an oxysalt mineral with essential cadmium. Canadian Mineralogist, 34, 623-630.〕
Keyite belongs to the biaxial optical class, meaning it has more than one axis of anisotropy (optic axis), in which light travels with zero birefringence, and three indices of refraction, nα = 1.800, nβ, and nγ = 1.870.〔http://www.mindat.org/min-2191.html. Accessed 2 December 2010.〕〔http://webmineral.com/data/Keyite.shtml. Accessed 2 December 2010.〕 Being a very rare cadmium copper arsenate, keyite is only found in Tsumeb, Namibia in the Tsumeb mine, a world famous copper mine known for its abundance of rare and unusual minerals.〔Cooper, M.A. and Hawthorne, F.C. (1996) The crystal structure of keyite, (As)6(O)2, an oxysalt mineral with essential cadmium. Canadian Mineralogist, 34, 623-630.〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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