Vibrational Spectra of Hetian Nephrite from Xinjiang
ZHANG Yong-wang1,2, LIU Yan3, LIU Tao-tao1, Muhetaer Zari2, LIU Yuan-qing1
1. State Key Laboratory for Petroleum Resource and Prospecting, Basin & Reservoir Research Center, Chinese University of Petroleum, Beijing 102249, China 2. College of Geological Exploration and Engineering, Xinjiang University, Urumqi 830046, China 3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
Abstract：In previous studies, EMPA, PIXE and others were employed to study the chemical compositions of nephrite separately without a systematical measurement. In the present study, XRF, XRD, IR and LR were used together to examine chemical and spectra characteristics of white, green and black nephrite from Hetian, Xinjiang. XRD results indicate that all nephrite samples consist of tremolite. Then IR spectra of nephrite samples suggest that the M—OH stretching vibration bands show that the M1 and M3 sites are not only occupied by Mg2+ and Fe2+, but also by Fe3+, which is consistent with the chemical compositions of these samples. This information might be useful to understanding the variety of nephrite. Their Raman spectra are almost the same, while some differences exist because of different content of FeO/Fe2O3.
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