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Empressite is a mineral form of silver telluride, AgTe. It is a rare, grey, orthorhombic mineral with which can form compact masses, rarely as bipyrimidal crystals. Recent crystallographic analysis〔L. Bindi ''et al.'', American Mineralogist, 89, 1043 (2004)〕 has confirmed that empressite is a distinct mineral with orthorhombic crystal structure, different from the hexagonal Ag5-xTe3 with which empressite has been commonly confused in mineralogy literature. At the same time, empressite does not appear on the equilibrium Ag-Te phase diagram,〔Karakaya, I., Thompson, W.T.: J. Phase Equilibria 12, 56 (1991).〕 and therefore it is only metastable at ambient conditions. Given infinite time, it would phase separate into pure Ag5Te3 and pure Te. The name empressite comes from the location of its discovery – the Empress Josephine mine, Saguache County, Colorado, USA. It was first described in 1914.〔 ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「empressite」の詳細全文を読む スポンサード リンク
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