碲硫铋矿(Bi_2TeS_2)在我国的首次发现和研究

THE DISCOVERY OF CSIKLOVAITE IN CHINA

碲硫铋矿(Csiklovaite)是一种很少见的矿物。国外报导的产地只有两处:罗马尼亚的锡克洛夫(Csiklov)(首先发现)和匈牙利;但其含量都很低,粒度细小,矿物学研究不够。福建马坑的碲硫铋矿在我国是首次发现,矿石含碲达百万分之几,在选矿产品中碲可富集到千分之几。碲主要呈碲硫铋矿和辉碲铋矿(Tetradymite)存在。

Csiklovaite is a rare mineral found in China. It occurs in the Makeng iron deposit, Fujian, in association with bismuthinite, tetradymite and molybdenite, sometimes showing subgraphic-texture intergrowing with the above mentioned minerals.Csiklovaite is yellow-grey, occurring as plate, tabular and grain aggregates. Specific gravity 7.0(meas.). Vickers hardness under 20 and 50g. loads is: VHN_(20g)=86; VHN_(50g)=264. Polish is not good. In reflected light csiklovaite is yellowish white in color with weak bireflection, showing distinct anisotropy. Reflectivity in air is R_(480nm)=50.5, R_(546nm)=51.2, R_(539nm)=52, and R_(656nm)=52.3.The formula of csiklovaite is Bi_(2.00)(Te_(1.00)S_(2.00))_3. Bi: (Te, 9)=2:3, Te:S =1:2.The strongest lines in X-ray powder pattern for csiklovaite are(in): 3.05 (10), 2.25(6), 1.91(6), 1.287(10), 1.194(6) Unit cell:a_0=4.12, c_0=28.25; Z=3.Tellurium which is of economic significance is present in tetradymite and csiklovaite from the Makeng iron ore.