【摘要】 铌铁锐钛矿是含铌、铁的锐钛矿变种。呈土黄色、褐棕色,板状或土粒状。反射率589nm,15.9％,显微硬度H_v=275.9kg/mm²。计算比重4.4g/cm³。主要化学成分Nb₂O₅34.92—44.3％,TiO₂ 29.38—37.58％,Fe₂O₃ 14.94—17.19％。化学式:(Ti_0.44Nb_0.31Fe_0.25)_1.00O₂X射线分析表明该矿物属四方晶系,α=3.828±0.002,c=9.682±0.009,空间群I4₁/amd,Z=4。 共生矿物钕易解石,深红色者变生现象轻微;浅黄色钕易解石与铌铁锐钛矿可能形成于稍晚、较低温度条件下的矿化过程。更多还原

【Abstract】 Niobium anatase,a new variety of anatase,occurs in a sodium-metasomatic rock in the Bayan Obo ore field, It is brittle, opaque or subtransparent and yellowish brown and brown in colour with resinous luster. It occurs as tabular or gradular aggregates. Hv=275.9kg/mm² and density （calc.）=4.4g/cm³.Electron microprobe analysis gave:Nb₂O₅34.92—44.30%, TiO₂ 29.30—37.58% and Fe₂O₃14.94—17.19%. Its chemical formula is (Ti_0.44Nb_0.31Fe_0.25)_1.00O₂.X-ray powder analysis shows that the mineral is tetragonal with a=3.828±0.002, c =9.682±0.009. Space group I4₁/amd, Z=4.The occurrence of the associated mineral aeschynite-（Nd）, light yellow in colour,be formed later at lower temperatures.更多还原