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cornubite : ウィキペディア英語版
cornubite

Cornubite is a rare secondary copper arsenate mineral with formula: Cu5(AsO4)2(OH)4. It was first described for its discovery in 1958 in Wheal Carpenter, Gwinear, Cornwall, England, UK.〔Claringbull, Hey and Davis, ''American Mineralogist'' (1959) 44: 1321〕 The name is from Cornubia, the medieval Latin name for Cornwall.〔 It is a dimorph of Cornwallite, and the arsenic analogue of pseudomalachite.
==Physical properties==
Cleavage is distinct in two directions, both perpendicular to the enlarged faces of the tabular crystals, intersecting at about 70°. Cornubite is fairly soft, with hardness 4, the same as fluorite, and specific gravity 4.64, which is similar to another copper arsenate, clinoclase, at 4.38, but much denser than quartz, at 2.66.

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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