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在我国广西发现的钡毒铁石
引用本文:赖来仁,施倪承.在我国广西发现的钡毒铁石[J].矿物学报,1997,17(2):120-125.
作者姓名:赖来仁  施倪承
作者单位:中国有色金属工业总公司矿产地质研究院!桂林,541004,中国有色金属工业总公司矿产地质研究院!桂林,541004,中国有色金属工业总公司矿产地质研究院!桂林,541004,中国地质大学!北京,100083
基金项目:国家自然科学基金!49272094
摘    要:1989年我们在广西德保矿区发现了钡毒铁石,其化学成分为(%):BaO8.45,Fe2O335.10,As2O538.15,K2O0.14,Al2O30.07,H2O 18.48,总量为100.38。其理想矿物分子式为Ba0.5Fe4(AsO4)。(OH)4·7H2O,与德国产出的钡毒铁石的矿物分子式[BaFe4(AsO4)3(OH)5·5H2O]有一定的差异,是毒铁石[KFe4(AsO4)3(OH)4·7H2O]的钡端员矿物。该矿物是黄绿色、浅黄色,立方体晶形,硬度H=3,实测比重D=3.00,N=l.724~l.731,均质性,常见光性异常。粉晶X射线分析主要衍射强线(um)为:O.805(200)(99),0.563(220)(23),0.399(400)(47),O.326(422)(100),0284(44O)(73),0.241(542)(33),0.178(841)(23),等轴晶系,空间群为P43m,晶胞参数a=1.603nm。

关 键 词:钡毒铁石  矿物研究  广西

BARIUM-PHARMACOSIDERITE FOUND IN GUANGXI,CHINA
Lai Lairen, Li Yi, Zhen Qiaorong, Shi Nicheng.BARIUM-PHARMACOSIDERITE FOUND IN GUANGXI,CHINA[J].Acta Mineralogica Sinica,1997,17(2):120-125.
Authors:Lai Lairen  Li Yi  Zhen Qiaorong  Shi Nicheng
Abstract:Barium-pharmacosiderite was found together with other secondary copper-iron arsenateminerals in a Cu-Sn deposit, Debao, Guangxi.Electron microprobe analysis in combination of gravimetric analysis gave: Fe2O3 35. 1O%, BaO8. 45%, As2O5 38. 15%, Al2O3 0. 07%, K2O 0. 14%, and H2O 18. 48%. The chemical formula is(Ba0.49, K0.03,) (Fe3.93, Al0.03) (AsO4)2.95, (OH)3.98. 7. 17H2O. H= 3, D= 3. OO, N= 1. 724~1. 731.In the transmitted light the mineral shows an isotropic character, but always optical anomalies.The stronger line in the X-ray powder pattern are 0. 8O5 (2OO) (99), O. 563 (22O) (23), O. 399(400) (47), 0. 326 (422) (100), 0. 284 (440) (73)',0. 241 (542) (33), and o. 178 (841) (23).The calculated unit cell a= 1. 603. Space group P43m.The infrared spectra show the absorption bands at 3 38O, 3 12O, 1 O70, 1 020, 8O0, 495, 4l0(cm-1)'
Keywords:barium-pharmacosiderite mineralogical study  Guangxi
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