Study on Mineralogy and Spectroscopy of Turquoises from Hami, Xinjiang
LIU Xi-feng1, LIN Chen-lu2, LI Dan-dan3,4*, ZHU Lin5, SONG Shuang6, LIU Yan7，SHEN Chong-hui8
1. Guangzhou College of South China University of Technology, Guangzhou 510800, China
2. School of Gemology, China University of Geosciences (Beijing), Beijing 100083, China
3. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
4. University of Chinese Academy of Sciences, Beijing 100049, China
5. National Gems & Jewelry Technology Administrative Center, Beijing 100013, China
6. Gem Appraisal Center of Peking University, Beijing 100871, China
7. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
8. School of Earth Sciences and Resources, China University of Geosicences (Beijing), Beijing 100083, China
Abstract：Recently, turquoise from Hami, Xinjiang Provence has been discovered with gem quality and large quantity. In this work, turquoise samples from Hami, Xinjiang were studied with X-ray diffractometer (XRD), laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS), scanning electronic microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (Raman), and ultraviolet-visible spectroscopy (UV-Vis) to obtain the mineralogy and spectra characteristics. The chemical composition of turquoise from Hami was characterized by rich Cr (1 617 ppm), V (435 ppm), Ti (428 ppm) and poor Ba (99.9 ppm). And, the color of turquoise gradually changed from green to blue with the decrease of the rate of Fe2O3/CuO. The SEM results showed that the turquoise crystals were mainly needle, columnar and long plate shape with the size of 0.2～3 μm. The infrared and Raman spectra of turquoise were induced by the vibration of phosphate group (located at 1 000~1 200 and 420~650 cm-1), hydroxy group (located at 3 400~3 600 cm-1) and crystal water (located at 3 000~3 300 cm-1). Besides, the UV-Vis spectra of the turquoise samples showed that the absorption peaks at 430 nm and 600~700 nm belonged to the electron transition of Fe3+and Cu2+, respectively.
Key words：Turquoise; Mineralogy; Spectroscopy; Hami, Xinjiang Province
刘喜锋，林晨露，李丹丹，朱 琳，宋 双，刘 琰，沈崇辉. 新疆哈密绿松石的矿物学和光谱学特征研究[J]. 光谱学与光谱分析, 2018, 38(04): 1231-1239.
LIU Xi-feng, LIN Chen-lu, LI Dan-dan, ZHU Lin, SONG Shuang, LIU Yan，SHEN Chong-hui. Study on Mineralogy and Spectroscopy of Turquoises from Hami, Xinjiang. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(04): 1231-1239.
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