【摘要】 最近在西藏罗布莎村豆荚状铬铁矿石中发现一个由70~80种矿物组成的地幔矿物群,其中包括新矿物罗布莎矿,还有金刚石、柯石英、碳硅石、方铁矿、以及Fe-Si相矿物。所有这些矿物都是从豆荚铬铁矿石的人工大样中经选矿后得到的。罗布莎矿作为主矿物而含有自然硅和fersilicite[FeSi]的包裹体或呈交生体与自然硅共生。罗布莎矿呈不规则粒状,粒径0.1~0.2mm,由细粒聚合体组成,呈钢灰色,金属光泽,不透明。以Si为基础实验分子式为Fe0.83Si2。X-射线分析资料斜方晶系,空间群Cmca,a=9.874(14)A。,b=7.784(5)A。,c=7.829(7)A。,V=601.7(9)A。3,Z=16。罗布莎矿已为国际新矿物和矿物命名委员会批准,样品保存在中国地质博物馆。更多还原

【Abstract】 Recently a mantle mineral group including about 70～80 subtipys of mineral have been discovered from podiform chromitite in Tibet,China. Recovered minerals include diamond,coesite,moissanite,wüstite,Fe-Si alloys and this new mineral luobusaite. All of these minerals were hand-picked from heary mineral separates of the podiform chromitite in the peridotite of the ophiolite in Tibet. Some grains of luobusaite are as host mineral with inclusions of native silicon or as a intergrowth with native silicon and Fe-Si phase.Laubusaite occurs as irregular grais with 0.1～0.2 mm in size,consisting of very fine grained aggregates,the mineral is steel-grey in colour,metallic luster,opaque.The empirical formula （ based on 2 for Si） is Fe 0.83 Si₂. 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。,V= 601.7 （9）A。3,Z=16. The mineral is named after its locality of occurrence-Luobusa Mine. The mineral has heen deposited at the Geological Museum of China. The mineral and its name have been approved by the Commission of New Minerals and Mineral Names,IMA. Number 2005-052a.更多还原