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Crookesite : ウィキペディア英語版
Crookesite

Crookesite is a selenide mineral composed of copper and selenium with variable thallium and silver.
==Characteristics==
Its chemical formula is reported either as Cu7(Tl,Ag)Se4 or (Cu,Tl,Ag)2Se.〔http://www.mindat.org/min-1159.html Mindat〕 It is formed by precipitation from hydrothermal fluids, and contains by mass: 16.3% Tl, 47.3% Cu, 2.9% Ag, and 33.6% Se.〔
Crookesite is an opaque, bluish grey to pink toned brown metallic mineral crystallizing in the tetragonal system. It has a Mohs hardness of 2.5 to 3 and a specific gravity of 6.9.

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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