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Volume 9 Issue 2
Jun.  2007
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YIN Xiao-ling, XIANG Xian-biao, PENG Ming-sheng. Mineralogical Characteristics of Ureyite in Jadeite Jade[J]. Journal of Gems & Gemmology, 2007, 9(2): 5-7.
Citation: YIN Xiao-ling, XIANG Xian-biao, PENG Ming-sheng. Mineralogical Characteristics of Ureyite in Jadeite Jade[J]. Journal of Gems & Gemmology, 2007, 9(2): 5-7.
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Mineralogical Characteristics of Ureyite in Jadeite Jade

  • Institute of Geologic Sciences of Guangdong Province, Guangzhou 510080, China

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  • Received Date: March 16, 2007
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  • In the paper, mineralogical characteristics and compositions of ureyite in jadeite jade are studied by using EPMA, X-ray diffraction and absorption spectroscopy analysis.The results show that ureyite is paragenous with jadeite jade, and the chemical formula of ureyite is(Na0.83Ca0.02)(Cr0.78Al0.10Fe0.08Mg0.02) Si2.06O6.The unit cell parameters of ureyite are a=9.530 Å, b=8.672 Å, c=5.264 Å, β=107.51°, V=414.88 and the density is 3.55g/cm3.Different shades of green in ureyite are related to the crystal-field transition frequency of Cr3+.
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    • References (2)
  • [1]
    Qui Mei Ou Yang.A terrestrial source of ureyite[J].The American Mineralogist 1984,69(1):180-183.
    [2]
    V M Khomenko A N Platomav.Electonic absorption spectra of Cr3+ zones in natural clinopyroxens[J].Physchem Minerals 1985,11(6):261-265.
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