Spectroscopic Study of Green-Yellow and Green Turquoise Associated Minerals from Zhushan, Hubei Province
KU Ya-lun1, YANG Ming-xing1, 2*, LI Yan1
1. Gemological Institue, China University of Geoscience, Wuhan 430074, China
2. Gem Testing Center, China University of Geoscience, Wuhan 430074, China
Abstract：Recently, there have been many natural minerals commonly known as “turquoise associated minerals”, which are rich in color, such as purple, white, brown, yellow-green, green and so on. However, green-yellow and green turquoise associated minerals have a more similar appearance to other color turquoise associated minerals and are more difficult to identify. In this study, to explore their different features, two green-yellow and green turquoise associated minerals samples (sample E and sample F) were selected from Zhushan County market of Hubei Province. These minerals have been used for the basic gemological test, electron microprobe micro, X-ray powder diffractometer, micro-laser Raman spectrometer as well as Ultraviolet-Visible spectrometer. The test results show that the main mineral components of the associated ores are fluorapatite, muscovite and so on. The results of electron microprobe backscattering photographs show that the associated mineral samples are polyphase mixtures of tiny crystalline particles. And quantitative analysis of the chemical composition of the two phases shows that the dark phase is an aluminium-containing silicate, while the light phase is calcium-containing phosphate. In addition, the samples also contained CuO (2.27%~6.22%) and FeO (2.43%~4.99%), whereas the contents of CuO and FeO in sample F are higher than those in sample E. Furthermore. Damaging test of X-ray powder diffraction can accurately test the main minerals of the samples which are fluorapatite, muscovite and a small amount of turquoise. The typical Raman spectra of fluorapatite near 964 cm-1 and muscovite near 203, 432, 709 and 3 626 cm-1 can be effectively identified from turquoise. The results of ultraviolet-visible absorption spectroscopy show that the color origin of the samples is similar to that of turquoise, mainly due to the electron transition of Cu2+ and Fe3+ ions. Based on the relatively systematic spectroscopic testing of the samples, the authors suggest that Raman spectroscopy is a nondestructive, rapid and effective method for identifying different mineral phases in turquoise associated minerals. The typical Raman peaks of fluorapatite and Muscovite can effectively distinguish them from turquoise.
库雅伦，杨明星，李 妍. 湖北竹山黄绿色-绿色绿松石伴生矿的谱学研究[J]. 光谱学与光谱分析, 2020, 40(06): 1815-1820.
KU Ya-lun, YANG Ming-xing, LI Yan. Spectroscopic Study of Green-Yellow and Green Turquoise Associated Minerals from Zhushan, Hubei Province. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(06): 1815-1820.
[1] Liu Ling, Yang Mingxing, L Yan, et al. Gems & Gemology, 2018, 54(3): 317.
[2] SHI Zhen-rong(石振荣). Geological of Jiangsu(江苏地质), 2008, 32(2): 109.
[3] SHI Zhen-rong, CAI Ke-qin, GONG Ming-quan(石振荣, 蔡克勤, 龚明权). Geological of Northwest(西北地质), 2008, 41(2): 56.
[4] ZHANG Pei-li（张培莉著）. Systematic Gemology(系统宝石学). Beijing: Geology Press(北京：地质出版社)，2006. 399.
[5] Cejka Jiri, Seikora Jiri, Macek Ivo, et al. Spectrochimica Acta Part A：Molecular and Biomolecular Spectroscopy, 2015, 149: 173.
[6] CAO Shu-hui, ZHANG Li-fei, SUN Qiang, et al(曹淑慧, 张立飞, 孙 樯, 等). Acta Petrologica et Mineralogica(岩石矿物学杂志), 2006, 25(1): 71.
[7] LIU Yu(刘 羽). Journal of Wuhan Institute of Chemical Technology(武汉化工学院学报), 2002, 24(1): 21.
[8] GUO Qian, XU Zhi(郭 倩, 徐 志). Acta Petrologica et Mineralogica(岩石矿物学杂志), 2014, 33(S1): 136.
[9] Reddy B, Frost R, Weier M, et al. Journal of Near Infrared Spectroscopy, 2006, 14(1): 241.
