硒硫锑矿的首次发现及其初步研究

硒硫锑矿首次发现于西秦岭南亚带拉尔玛金-铜-铀建造矿床中。与其共生的矿物有:自然金,灰硒汞矿,灰硒铅矿,硒锑矿,辉砷铜矿,辉砷镍矿,硒硫锑铜矿,另外还有两种含硒的矿物可能是硒镍矿,硒金矿。该矿物颗粒细小,粒度为0.01—0.5mm。显微硬度VHN_(50)=68.25—128.0kg/mm~2。电子探针分析结果(W_B/%):Sb 59.75—68.52,S 12.08—23.71,Se6.88—27.50。据其平均值所计算的分子式为Sb_(2.0455) Hg_(0.0051) (S_(2.1818)Se_(0.8182)_3,简写式为Sb_2(S,Se)_3。含硒量低的硒硫锑矿的粉晶数据与辉锑矿大致相似。

THE FIRST DISCOVERY AND PRELIMINARY STUDY OF SELENIO-SULFANTIMONIDE IN CHINA

Selenio-sulfantimonide,discovered for the first time in China,Occurs in Laerma deposit of gold-copper-uranium formation. Associated minerals include: native gold, tiemannite. clasthalite, lautite, aurostibite, gersdorffite. quartz, barite, etc. It occurs as fine grains measuring about 0. 01-0. 5mm. Electron microprobe analysis of twenty-six grains gave the results as follows(W_B/%):Sb 59. 75-68. 52(64. 68 on average),S 12. 08-23. 71(18. 17 on average).Se 6. 88-27. 50(16. 78 on average) , lead to the formula Sb_(2.0155) Hg_(0.0051) (S_(2.1818)Se_(0.8182)_3.and its simplified formula Sb_2(S,Se)_3. Reflectance values(SiC standard)are given at A wave lengths, representative R_(max) and R_(min) values are 481 nm 16. 0,32. 7; 513 nm 45. 3,31. 6;592 nm 46. 2. 32. 4;645nm 44.4 ,32.4. Microhardness 68. 25-128. 0kg/mm~2 for 50g. load. In comparison the unit-cell parameter with sulfantimonide, the lower Se-bearing sulfantimonide "a" and "b" values are smaller, but "c" is biger.