Luobusaite:A New Mineral  

作　　者：BAI Wenji SHI Nicheng FANG Qingsong LI Guowu XIONG Ming YANG Jingsui RONG He 

机构地区：[1]Institute of Geology, Chinese Academy of Geological Sciences, Baiwanzhang Road 26, Beijing 100037 [2]X-ray Laboratory, China University of Geosciences （Beijing）, Xueyuan Road 29, Beijing 100083

出　　处：《Acta Geologica Sinica(English Edition)》2006年第5期656-659,共4页地质学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant 40620120098 and 40472025).

摘　　要：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 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.

关 键 词：new mineral luobusaite CHROMITITE OPHIOLITE TIBET 

分 类 号：P57[天文地球—矿物学]