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Tsumebite is a rare phosphate mineral named in 1912 after the locality where it was first found, the Tsumeb mine in Namibia, well known to mineral collectors for the wide range of minerals found there. Tsumebite is a compound phosphate and sulfate of lead and copper, with hydroxyl, formula Pb2Cu(PO4)(SO4)(OH). There is a similar mineral called arsentsumebite, where the phosphate group PO4 is replaced by the arsenate group AsO4, giving the formula Pb2Cu(AsO4)(SO4)(OH). Both minerals are members of the brackebuschite group. ==The brackebuschite group== The minerals in the brackebuschite group have the general formula A2B(H2O,OH)(TO4)2 and crystallise in the monoclinic system, space group P21/m. The group includes:〔 *brackebuschite Pb2Mn3+(VO4)2(OH) *arsenbrackebuschite Pb2(Fe3+,Zn)(AsO4)2(OH,H2O) *gamagarite Ba2Fe3+(VO4)2(OH) *goedkenite Sr2Al(PO4)2(OH) *bearthite Ca2Al(PO4)2OH *tsumebite Pb2Cu(PO4)(SO4)(OH) *arsentsumebite Pb2Cu(AsO4)(SO4)(OH) *vauquelinite Cu2+Pb2(CrO4)(PO4)(OH) *fornacite CuPb2(CrO4)(AsO4)(OH) *molybdofornacite CuPb2MoO4AsO4(OH) 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「Tsumebite」の詳細全文を読む スポンサード リンク
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