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chalcophyllite
Chalcophyllite is a rare secondary copper arsenate mineral occurring in the oxidized zones of some arsenic-bearing copper deposits. It was first described from material collected in Germany. At one time chalcophyllite from Wheal Tamar in Cornwall, England, was called tamarite, but this name is now discredited〔 (not to be confused with the amphibole mineral taramite, which is quite different). At Wheal Gorland a specimen exhibiting partial replacement of liriconite, Cu2Al(AsO4)(OH)4·4(H2O), by chalcophyllite has been found.〔 The mineral is named from the Greek, ''chalco'' "copper" and ''fyllon'', "leaf", in allusion to its composition and platy structure. It is a classic Cornish mineral that can be confused with tabular spangolite.
==Formula==
Two different formulae are quoted in the literature for chalcophyllite, Cu18Al2(AsO4)4(SO4)3(OH)24·36(H2O)〔〔〔 (molar mass 3098 g) and
Cu18Al2(AsO4)3(SO4)3(OH)27·33(H2O)〔〔〔 (molar mass 2956 g). The difference reflects the fact that the water content varies at room temperature based on relative humidity.〔
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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