天然铜锌系列中的铜锌矿物(Cu_2Zn)的研究

THE STUDY OF NATURAL Cu-Zn SERIES MINERAL-TONGXINITE

在西藏玉龙和马拉多麻岩铜矿及四川若尔盖巴西金矿床中，先后发现天然铜锌矿物（Cu_Zn），该矿物为已发现的丹巴矿（CuZn_2）另一个端元的成员，本文初步研究了其产出特点、物理性质及化学成分特征。

We found a natural Cu-Zn mineral in porphyry copper ore deposit (Tibet) and gold ore deposit (Sichuan). The mineral was named tongxinite with a chemical formula of Cu2Zn.The tongxinite was discovered in three districts: Yulong (Tibet), Malaisond (Tibet)and Ruoergai (Sichuan). In the Yulong ore district, tongxinite occurs in the silicification zone (alteration zone) and its associated minerals are galenobismutite, cosalite, chalcopyrite, etc.; in the Malasondo ore district the mineral tongxinite was discovered in rhyolite (liparite)and its associated minerals are pyrite, chalcopyrlte, enargite, tennantite, bornite,etc.; in Ruoergai (Sichuan) tongxinite was discovered in the silicification zone, with associated sphalerite, marcasite, chalcopyrite, etc.The mineral is granular in form (d = 0. 036 - 0. 2 mm). It is gold-yellow in colour,metallic in luster, Hv= 152. 7-176. 13(lg), Dx = 7. 38/cm3.The reflectance indices are given as follows: 77. 50 (660nm ), 73. 58 (640nm ), 68. 80(620nm), 65.10(600nm), 61. 45 (580nm), 58.00(560nm), 56. 63(540nm), 49. 02 (520nm),41. 12(480nm). X=0. 384 4, Y=0. 379 0, λd=479, Pe=0. 237 0, Rvis=58. 12%.The chemical formula is Cu2Zn or ZnCu2, X-powder diffraction data are given below:2. 153(8,320), 2. 100 6(10,321), 1. 849(7,410), 1. 814 6(7,330), 1. 294 0(5,600, 442),1. 230 0(1, 620), 1.104 2(5,700), 1. 062 0 (4,720), 0. 645 6(3,842), 0. 824 9(3,664). The cell paramcters a = 0. 773 5 nm, V= 0. 642 786 nm3; cubic.The microscopic, microprobe, X-ray surface and Xuray diffraction data are all given in this paper.Danbaite-zhanghengite-tongxinite constitute a natural integrated mineral series discovered in China.