| 光谱学与光谱分析 |
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| Vibrational Spectra of Caesious Nephritefrom Qinghai Province |
| CHEN Quan-li, XU Ya-lan, AI Su-jie, HE An-qi, YIN Zuo-wei* |
| Gemmological Insititute, China University of Geosciences, Wuhan 430074, China |
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Abstract Qinghai caesious nephrite is discovered in the 1990s in the Golmud area of Qinghai Province. The conventional gemological testing methods, electron microprobe, infrared absorption spectroscopy and Raman spectroscopy were used in this study to analyze the chemical composition and infrared spectra characteristics of the caesious nephrite, selected from the jade mine of Xiaozhaohuo river in Golmud area. The results show that, the gemological physical properties of the Qinghai caesious nephrite are similar to other origin nephrite. Electron microprobe analysis indicates that the MgO, CaO and SiO2 are the major and stable composition for the caesious nephrite. The content of MgO and CaO are 18.572%～23.603% and 12.333%～12.807% respectively. Moreover, the content of SiO2 is 56.799%～59.926%. In addition, it also contains a higher content of FeOT (Wt%: 1.924%～8.699%) and an amount of Al2O3, TiO2 and Na2O. Infrared absorption and Raman spectra show that the Qinghai caesious nephrite has a characteristic spectral features of tremolite indicating it is mainly composed of tremolite. The different frequency of the infrared absorption bands is due to the difference of Mg—Fe2+ isomorphous substitution and Fe2+ content of the caesious nephrite. Comprehensive analysis of chemical composition and vibrational spectroscopy indicate that the color of dark gray blue for the Qinghai nephrite is mainly related to its high content of FeOT, and the Fe is a main coloring element.
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Received: 2013-09-27
Accepted: 2013-12-08
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Corresponding Authors:
YIN Zuo-wei
E-mail: yinzuowei1025@163.com
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