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铁、锰、铬在工业上叫做黑色金属,是炼钢的重要元素。前两次谈过了铁矿物及锰矿物,这次我们来谈谈含铬的矿物。铬是一种白色发亮的金属,比重为7.14,在1800℃时熔化,为所有金属中最硬者。普通温度下,铬在水及空气中非常稳定。它的地球化学性质与铁相似、所以苏联科学院院士查瓦里茨基将其归入铁族元素。铬在地壳中的平均含量约为地壳重量的0.035％,约为锰平均含量(0.10％)的1/3,为铁平均含量(4.20％)的1/120。地壳中的铬分布并不均匀,在橄榄岩中为0.34％,辉长岩中为0.034％,闪长岩中为0.0068％,
Iron, manganese, chromium in the industry called ferrous metal, is an important element of steelmaking. Speaking about iron minerals and manganese minerals two times before, let’s talk about chromium-containing minerals. Chromium is a white shiny metal with a specific gravity of 7.14 and melts at 1800 ° C, the hardest of all metals. At ordinary temperatures, chromium is very stable in water and air. Its geochemical properties and iron are similar, so the Soviet Academy of Sciences, Chavalitki will be classified as iron family elements. The average Cr content in the crust is about 0.035% of the crust weight, about 1/3 of the average manganese content (0.10%) and 1/120 of the average iron content (4.20%). Cr in the crust is not uniform, with 0.34% in peridotites, 0.034% in gabbro, 0.0068% in diorite,