新矿物—硒锑矿

ANTIMONSELITE——A NEW MINERAL

硒锑矿是一种锑的硒化物新矿物,化学式为(Sb_(1.87)Hg_(0.06) Cu_(0.05) As_(0.01))_(1.99)(Se_(2.99)S_(0.02))_(3.01),产于贵州省504铀汞钼多金属矿床内的含铀方解石脉中。颗粒细微,几微米至十几微米,呈他形粒状和自形针状,集合体为放射状。肉眼观察为黑色。反光显微镜下为白色、非均质。R′_α=39.7,R′_γ=42.2。计算密度为5.88g/cm^3。晶胞参数:a=1.1593(3);b=1.1747(3),c=0.3984(1)nm。斜方晶系,空间群为Pbnm。共生矿物有硒汞矿、白硒铁矿、硒铅矿以及尚未确定的大量硒矿物。此外,还有黄铁矿、胶黄铁矿、闪锌矿、方铅矿、辰砂、沥青铀矿,赤铁矿和方解石。其形成温度为135～148℃。

Antimonselite, (Sb_(1.87)Hg_(0.06)Cu_(0.05)As_(0.01))_(1.99)(Se_(2.99)S_(0.02))_(3.01) is a new mineral found in U-bearing calcite veins in an U-Hg-Mo polymetallic deposit in Guizhou, China. It is very fine in grain size, ranging from a few to less than twenty μm across, and occurs as anhedral grains and euhedral acicular crystals in radiating aggregates. Antimonselite is black in hand specimen, with white reflection and distinct anisotropism under reflected light. R'_α= 39.7, R'_γ=42.4. Calculated density, 5.88g/cm^3. It is rhombic, with a space group of D^(?)_(2R)-Phnm, a = 1.1593nm, b= 1.1747nm, c= 0.3984nm. Associated minerals include coccinite, ferroselite, clausthalite and a number of unidentified selenium minerals. Other minerals in association with antimonselite are pyrite, coll- oidal pyrite, sphalerite, galena, cinnabar, uraninite, hematite and calcite. Antimonselite was formed between 135 and 148℃.