Siberian Nephrite
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摘要: 软玉是西伯利亚地区主要的宝石品种。软玉矿床集中在西伯利亚克拉通南部:西萨彦、东萨彦、Djida和Vitim。大多数软玉矿床与纯橄岩-二辉岩建造中的超基性岩有关。Vitim矿床有两种成因类型:超基性岩的蛇纹石化作用及白云质大理岩与花岗岩接触带的碳酸盐化作用。超基性岩型软玉多为亮绿色,常有磁铁矿、铬铁矿和硫化物浸染。产于大理岩和花岗岩接触带的浅色软玉,透明度高,无金属矿物浸染。详细介绍了西伯利亚软玉的特征(颜色、化学组成及组构)。Abstract: Nephrite occupies a leading place among the colour stones discovered in Siberian. The majority of nephrite deposits are situated in the south part of Siberian craton: Western Sayan, Eastern Sayan, Djida and Vitim. Most part of nephrite deposits is connected with ultrabasics of a dunite-harzburgite formation and Vitim nephrite deposit is connected with serpentinization from ultrabasics and carbonation. Many ultrabasics-type nephrites have bright green colour and have ore dissemination with magnetite, chromite and sulfide. The light-coloured nephrite, which formed on the contact zone of the dolomitic marbles and the granites, has more translucency and practically has not ore dissemination. The characteristics of Siberian nephrite are introuduced in detail including the colour, composition and texture structure.
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Keywords:
- nephrite /
- serpentinization /
- carbonation /
- light coloured variety /
- green variety /
- Siberian craton
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