Spectroscopy and Spectral Analysis, Volume. 38, Issue 4, 1231(2018)
Study on Mineralogy and Spectroscopy of Turquoises from Hami, Xinjiang
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.
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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[J]. Spectroscopy and Spectral Analysis, 2018, 38(4): 1231
Received: Feb. 22, 2017
Accepted: --
Published Online: Jun. 12, 2018
The Author Email: Xi-feng LIU (liuxf@gcu.edu.cn)