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砷铝铁石的发现及其初步研究
引用本文:李艺,赖来仁.砷铝铁石的发现及其初步研究[J].矿物学报,1998(4).
作者姓名:李艺  赖来仁
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
基金项目:国家自然科学基金!49272094
摘    要:1986年,在广西德保铜锡矿床氧化带铁帽中发现有砷铝铁石,针柱状晶呈晶簇状产出。鲜红色至褐红色,硬度HM=3.5,DX=5.34,折光率大于2。五个颗粒电子探针分析平均化学成分(%)为Fe2O320.77.PbO38.29,As2O5;36.64.CaO0.24.Al2O30.43,SiO20.30,H2O+末分析(以2.85%计)计算出分子式:Pb1.11Fe1.69Al0.05Ca0.03(AsO4)2.07(SiO4)0.03]2.10(OH)2.05,粉晶X射线分析主要衍射线(nm)有:0.324(10)(202),0.295(8)(15),0.305(7)(40),0256(7)(242),0.458(6)(211),0.418(5)(131),0.356(5)(311),0.273(5)(251),斜方晶系.计算出晶胞参数a=1.2281nm,b=1.6657nm,c=0.7663nm,Z=8。红外吸收光谱分析显示有波数为3448,3405,1638,1082,864,808,758,459(cm-1)等吸收带。

关 键 词:砷铝铁石  砷酸盐  广西

THE DISCOVERY OF CARMINITE AND ITS PRELIMINARY STUDY
Li Yi, Lai Lairen.THE DISCOVERY OF CARMINITE AND ITS PRELIMINARY STUDY[J].Acta Mineralogica Sinica,1998(4).
Authors:Li Yi  Lai Lairen
Abstract:Carminite was first discovered in the oxldation zone of the Debao skarn-type Cu-Sn ore deposit in Guangxi. It is red or brownish-red in color and acicularmprismatic in crystal form.Transparent, HM = 3.5, Dx = 5-34 g/cm3, biaxial ( ). Electron microprobe analysis glves an aver age composltion of PbO 38. 29, Fe2O3 20. 77, As2O5 36. 64, CaO 0.24, Al2O3 0. 43, SiO2 0. 30 (%)and H2O 2. 85 (theoretical ). The strongest lines in the X-ray powder pattern are 0. 324 (10)(202), 0. 295(8)(151), 0. 305(7) (400), 0. 256(7) (242), 0. 458(6)(211),0. 418(5)(13l ), 0. 324 (5) (:311), and 0. 273(5) (251). The calculated cell dimensions a=1. 228 lnm, b=1. 665 7 nm, c = 0. 766 3 nm;Z=8, orthorhomic, S. G. D-Cccm. Infraured spectra show absorptlon bands at 3 448, 3 405, 1 638. (1 082), 864, 808,758, (593), 459 (cm-1).
Keywords:carminite  arsenate  Guangxl
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