P57
Acknowledgements We thank Prof. Ernst A. J. Burke （Chairman of CNMMN） for his help and advice. This work was financially supported by the National Natural Science Foundation of China （Grant 40620120098 and 40472025）.
A group of mantle minerals including about 70-80 subtypes of minerals are discovered from a podiform chromitite in Tibet, China. Recovered minerals include diamond, coesite, moissanite, wustite, Fe-silides and a new mineral, luobusaite. All of these minerals were hand-picked from heavymineral separates of the podiform chromitite in the mantle peridotite of an ophiolite. The grains of luobusaite are as host mineral with inclusions of native silicon or as an intergrowth with native silicon and Fe-Si phase. Luobusaite occurs as irregular grains, with 0.1-0.2 mm in size, consisting of very finegrained aggregates. The mineral is steel-grey in color, metallic luster, and opaque. The empirical formula （based on 2 for Si） is Fe0.83Si2, according to the chemical compositions of luobusaite. X-ray powder-diffraction data： orthorhombic system, space group Cmca, a = 9.874 （14） A, b = 7.784 （5） A, c= 7.829（7） A, Z=16.
A group of mantle minerals including about 70-80 subtypes of minerals are discovered from a podiform chromitite in Tibet,China.Recovered minerals include diamond,coesite,moissanite,wustite,Fe-silides and a new mineral,luobusaite.All of these minerals were hand-picked from heavy-mineral separates of the podiform chromitite in the mantle peridotite of an ophiolite.The grains of luobusaite are as host mineral with inclusions of native silicon or as an intergrowth with native silicon and Fe-Si phase.Luobusaite occurs as irregular grains,with 0.1-0.2 mm in size,consisting of very fine-grained aggregates.The mineral is steel-grey in color,metallic luster,and opaque.The empirical formula(based on 2 for Si)is Fe0.83Si2,according to the chemical compositions of luobusaite.X-ray powder-diffraction data:orthorhombic system,space group Cmca,a = 9.874(14)?,b = 7.784(5)?,c= 7.829(7)?,Z=16.
BAI Wenji SHI Nicheng FANG Qingsong LI Guowu XIONG Ming YANG Jingsui RONG He.2006. Luobusaite： A New Mineral[J]. ACTA GEOLOGICA SINICA(English edition),80(5):656~659
复制
