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年来中国科学院地质研究所矿物学研究室在野外工作中获得不少新的矿物资料。经过实验室研究已经确定为新的稀有元素矿物的有以下四种,详细的研究结果即将发表,兹先简报如下:包头矿 Ba(Ti,Nb)_2SiO_7 这种矿物为四方形或柱状晶体,大小达8—10厘米,四方晶系,有两组解理。颜色为浅褐至黑色。玻璃光泽。比重4.42。硬度6。一轴晶,光性(+)。ω=1.94,∈=2.16;强多色性,∈=黑褐色至浅绿黄色,ω=几乎无色,吸收性∈>ω。单位晶胞大小
In recent years, the Institute of Geology, Chinese Academy of Sciences, Department of Mineralogy in the field work to obtain a lot of new mineral information. After laboratory research has been identified as a new rare element minerals are the following four kinds of detailed research results are about to be published, the first briefing is as follows: Baotou mine Ba (Ti, Nb) _2SiO_7 This mineral is a square or columnar crystals, size Up to 8-10 cm, tetragonal system, there are two groups cleavage. The color is light brown to black. Shiny glass Proportion 4.42. Hardness 6. One-axis crystal, light (+). ω = 1.94, ∈ = 2.16; strong polychromaticity, ∈ = dark brown to light greenish yellow, ω = almost colorless, absorptive ∈> ω. Unit cell size