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Volume 13 Issue 4
Dec.  2011
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ZHANG Pan, LIU Xi-feng, LI Jing-yan, CHEN Mei-hua. Comparative Analysis of Gemmological Characteristics of Brown-white Nephrites from Xinjiang,Qinghai and Russia[J]. Journal of Gems & Gemmology, 2011, 13(4): 31-38.
Citation: ZHANG Pan, LIU Xi-feng, LI Jing-yan, CHEN Mei-hua. Comparative Analysis of Gemmological Characteristics of Brown-white Nephrites from Xinjiang,Qinghai and Russia[J]. Journal of Gems & Gemmology, 2011, 13(4): 31-38.
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Comparative Analysis of Gemmological Characteristics of Brown-white Nephrites from Xinjiang,Qinghai and Russia

  • 1. Guangzhou College, South China University of Technology, Guangzhou 510800, China;

  • 2. Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China;

  • 3. Gemmological Institute, China University of Geosciences, Wuhan 430074, China

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  • Received Date: April 11, 2011
    Graphical Abstract
    • Abstract
  • In order to identify the differences of structures，mineral components and genesis among the brown－white nephrites from Xinjiang，Qinghai in China and Russia，on the basis of appearance characteristics observation，this paper investigates the brown－white nephrite samples from Xinjiang，Qinghai in China and Russia by means of conventional gemmological methods，polarizing microscope，XRD and EPMA，and carries out a comparative analysis of structures，mineral components，chemical compositions and formation reasons.The results show that the main mineral component of the brown－white nephrite samples is tremolite while the secondary mineral component is different.The brown－white nephrite samples from Xinjiang in China and Russia have felt－like interweaving texture while the brown－white nephrite samples from Qinghai in China has fibrous blastic and fibrous cryptocrystalline texture.Brown is the secondary colour，which is caused by limonite.According to the related geological background and weathering features，it can be inferred that the different appearance characteristics of the brown－white nephrite from three localities are mainly influenced by the surrounding environment changes after the later stage and finishing stage of metallogenic period of nephrite.
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    • References (11)
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