在广西德保发现的墨绿砷铜石和羟砷铜石
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Cornwallite and Cornubite Discovered in Debao, Guangxi
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    摘要:

    墨绿砷铜石和羟砷铜石为砷酸盐矿物,于1984年发现于广西省德保矽卡岩型铜—锡矿床氧化带中,在我国尚属首次发现。笔者对其进行了物理性质、化学成分的研究,并进行了X射线粉晶分析、红外光谱分析以及差热分析,其结果是化学成分与X光粉晶数据与国外已知数据基本一致,补充了这两种矿物的红外光谱数据和差热分析数据,从而提高了这两种矿物的研究程度。通过研究,发现这两种矿物化学成分相近,但结构晶系相异,二者常密切共生。文章最后还探讨了这两种矿物的成因。

    Abstract:

    Cornwallite and cornubite were found in oxidized zone of the Debao skarn type Cu-Sn ore deposit in Guangxi. The former is jade green and bluish green in color and radial-fibrous, platy and botryoidal in form. The wet chemical analysis shows its composition to be Cu0 60.96, As25 30.53, A1203 0.13, Si02 0. 68, P2O5 0.50, Fe0 0.15, H2O+ 6.98, totally 99.93 (in percentage), with the ideal chemical formula being [Cu5(AsO4)2(OH)4.H2O]·The X-ray powder data agree with JCPDS 12-287, and the strong diffraction lines are 4.77(210)(3), 4.56(001)(7),3.52(111)(10),3.21( 4 O1)(8), 3.12( 3 11)(5),3.02 (311)(5), 2.74 (411)(5), 2.49(511)(4), 2.43(601)(6),2.30( 6 11)(6),1.888(3),1.773(4),1.651 (7),1,532(3).Calculated cell dimensions a=17.547A,b=5,914A.c= 4.666A, β== 91. 6º,Z.=2;mononlinic; space group P21/a: H=4, D(mean)=4. 43. Refractive indices: Ng = 1 .846, Nm=1. 843, Np=1.833(±0.002).Biaxial negative, 2V=60º一 70º. The cornubite is green or greyish green in color and botryoidal in form. The electron, microprobe analyses of four grains are Cu0 62.29%,As2O31.54%, Feo 0.20% and sio2 0.13%(H2O+ undetermined), suggesting an ideal chemical formula of [Cu5(As04)2(OH)4], The X-ray powder data are basically consistent with JCPDS 12-228. The strong diffraction lines are 5.355(20), 4.711(100), 4.585(30), 3.587(30), 3.492(70), 3.101(30), 2.683(80), 2.557(40), 2.483(40), 2.300(50),1.746(30),1.571(30),1.519(30), 1.374(20).H=4. D(mean)=4.51; Biaxial negative, 2V=30º -40º (eye estimation).Refractive indices n=1.75- 1.85± (n=1.798 as calculated by Graston formula).

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赖来仁,李艺, 1989. 在广西德保发现的墨绿砷铜石和羟砷铜石[J]. 岩石矿物学杂志, 8(1):71~78.
Lai Lairen, Li Yi, 1989. Cornwallite and Cornubite Discovered in Debao, Guangxi[J]. Acta Petrologica et Mineralogica, 8(1): 71~78.

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