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Jun.  1999
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Xue Qinfang. IDENTIFICATION OF NATURAL, SYNTHETIC AND PLASTIC SIMULATED OPALS[J]. Journal of Gems & Gemmology, 1999, 1(2): 49-52.
Citation: Xue Qinfang. IDENTIFICATION OF NATURAL, SYNTHETIC AND PLASTIC SIMULATED OPALS[J]. Journal of Gems & Gemmology, 1999, 1(2): 49-52.
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IDENTIFICATION OF NATURAL, SYNTHETIC AND PLASTIC SIMULATED OPALS

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

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  • Received Date: October 21, 1998
  • Revised Date: December 14, 1998
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    • Abstract
  • This article describes the examination of natural, synthetic and plastic simulated opals by basic gemmological testing, X-ray fluorescence analysis, infrared absorption spectra and thermal analysis. Specific gravity, 5 851, 5 730, 4 700, 1 730 cm-1 infrared absorption spectra and trace elements CI, Zr etc are main characteristics for identifying natural opal and various synthetic opals. T he characteristics mentioned above also prove that Gilson opal is far lower than natural opal in water content.
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    • References (3)
  • [1]
    李景芝.天然、合成、仿制欧泊的鉴别.中国宝石，1997, 6(2)
    [2]
    Scarratt K, Kammerling R C and Koivula F 1. Opalite triplets——new imitation opal. The Journal of Gemmology, 1993, 23 (8); 473~480
    [3]
    Scarratt K. Notcs from the laboratory-15. The Journal of Gemmology.1992，23(3); 134~135
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