A study of gemology and mineral spectroscopy characteristics of peridot from Pakistan
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P578.94+2;P575.4

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    Abstract:

    Microscope, LA-ICP-MS, (Micro)FT-IR, UV-Vis, Raman and other methods were used to analyze conventional gemology, chemical element content and spectral features of Pakistan peridot, so as to discuss its origin characteristics. The result shows that Pakistan peridots contain black Vonsenite-Ludwigite needle and punctiform msgnetite. Compared with peridots from the USA, China, Ethiopia, Vietnam and Madagascar, Pakistan perdots have higher Li, B, Sc but lower Zn, Cu, with relatively lower V/Sc ratio. The absorption bond around 3 580 cm-1 in the infrared absorption spectrum of peridot in Pakistan is related to the [Si]=(4H)SiX substitution mechanism, indicating that the crystal structure contains a certain amount of structural water. The strong absorption near 380, 450, 490, 635 nm in UV-Vis spectrum is related to O2-→Fe3+ transition, 6A14A1+4E(4G)in d-d transition of Fe3+ and 5T2g3T2, 5T2g3T1g electron transition of Fe2+. It is concluded that inclusion, trace element and structural water-induced infrared absorption band can be used as the origin identification characteristics of peridots in Pakistan.

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阮维迪,周征宇,DIETMAR Schwarz,杨萧亦,陈彦宇,刘奕岑,2021,巴基斯坦橄榄石宝石学及矿物谱学特征研究[J].岩石矿物学杂志,40(3):593~604. RUAN Wei-di, ZHOU Zheng-yu, DIETMAR Schwarz, YANG Xiao-yi, CHEN Yan-yu, LIU Yi-cen,2021,A study of gemology and mineral spectroscopy characteristics of peridot from Pakistan[J]. Acta Petrologica et Mineralogica,40(3):593~604.

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History
  • Received:March 26,2020
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  • Online: May 22,2021
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