道马矿和红石矿的最新研究资料

New Data for Daomanite

道马矿与其他铂新矿物于1974年作了初步报道(於祖相等,1974)。1978年对道马矿的进一步工作成果又作了报道(於祖相等,1978)。本矿物在1982年获得国际新矿物与矿物命名委员会的批准(Bul-letin,1976,1982;Fleisher et al.,1976a,1976b)。由于当时条件所限,道马矿反射率仅有4个波段数值。现重进行测定以及对矿物的晶胞参数等用四圆衍射仪进行修正,并补充矿物新的产状以及矿物命名根据。

This paper deals with some additional data about Daomainte, which was published in Acta Geologica Sini-ca, 1978. No. 2. Daomanite found in veins of a platinum-bearing cobalt-copper ores in contact zone of pyroxen-ite with anorthosite or granite-gneiss. The chief ore minerals are bornite, chalcopyrite, limonite, carrolite, pyrite. Lesser ore minerals are tetrahedrite, galena, molybdenite, calvorolite, associated with sperrylite, cooperite, moncheite, cobaltmalanite, yixunite and damiaoite. Platinum contact metasomatism deposit is first reports in world. Damoanite also found in peridotite-pyroxenite rocks in lense ore bodies, long 4 -5 meters, wide 40-50 cm. The chief ore minerals is chalcopyrite. The platinum minerals are sperrylite, monchleite and daomanite. The daomanite is much bigger than in contact metasomatism deposits. Daomanite occurs as idiomor-phic tabular crystals and is formed by replacement of bornite. Crystal with elongate b {010}. Frequent forms of crystal morphology, b {010} prominent, a {100}, c{001}, n{011}. Cleavege {010} perfect, {100}, {001} distinct, {110} less distinct. Curved faces common. Size 0. 2-0. 3 mm, thickness 0. 05 mm. Frequently in elbow ||shaped multiple, twin plane {010}. Luster metallic. Color steel grey. On fresh fracture is silver grey. Insoluble in HNO3 and HC1. Color: yellowish with green tinct, anistropic strong. Under completely crossed nicols brass grey with reddish. Under not complete crossed nicols with 1°-2°, blue green to reddish. Parallel-axial extinction. Pleochroism and Birellectance distinct ∥c yellowish with green tinct. ⊥c yellow, take a good polished. Reflectance values were measured in air by using WTiC as standard, with MPM-400 micropho-tometer. From this, the refectance, dispersive and color coefficient ave & showned in fig 1 and table 1. By single-crystal weissensberg and rotation photography, daomanite exhibites an orthorhombic lattice. The space group is Ama2 or Amam. The cell dimensions is corrected by four circle diffractometer: a00. 5852 nm; b0 1. 5876 nm; c00. 3756 nm, Z = 4. D(1calc) = 7. 57. The three chemical compositions of daomanite were having a minor content of Rh by electron microprobe analysis. The analysis gives the formula Pt0.9649, Rh0. 0117, Cu0.9649. AS1.0823,S2.004, which is close to the ideal formula PtCuAsS2. The mineral is named after its two ocality. One is at Sandao village and other is at Tiema village. Daomanite is kenock together later syllable for its name.