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Aheylite : ウィキペディア英語版
Aheylite

Aheylite is a rare phosphate mineral with formula (Fe2+Zn)Al6(HREF="http://www.kotoba.ne.jp/word/11/oxygen" TITLE="oxygen">OH)4|(PO4)2 )2·4(H2O). It occurs as pale blue to pale green triclinic crystal masses.〔(Aheylite ). Handbook of Mineralogy〕 Aheylite was made the newest member of the turquoise group in 1984 by International Mineralogical Association Commission on New Minerals and Mineral Names.
==Composition==
The turquoise group has a basic formula of A0-1B6(PO4)4-x(PO3OH)x(OH)8·4H2O. This group contains five other minerals. In addition to aheylite: planerite, turquoise, faustite, chalcosiderite, and an unnamed Fe2+-Fe3+ analogue. Aheylite is distinguished in this group by having Fe2+ dominant in the A-site. The ideal aheylite has a formula of Fe2+Al6(PO4)4(OH)8·4H2O. Its color is pale blue or green. With turquoise family the blue color is said to come from the octahedral coordination of Cu2+ in the absence of Fe3+.〔

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