A combinative technique to recognise and discriminate turquoise stone |
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| Institution: | 1. Key Lab of Process Analysis and Control of Sichuan Universities, Yibin University, Yibin, Sichuan, 644000, China;2. Hospital, Yibin University, Yibin, Sichuan, 644000, China;1. Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará Quixadá, CE 63.900-000, Brazil;2. Deparamento de Física, Universidade Federal do Ceará, Fortaleza, CE 60455-760, Brazil;3. Instituto de Ciências Exatas, Universidade Federal do Sul e Sudeste do Pará, CEP 68.505-080 Marabá, PA, Brazil;4. Universidade Federal do Cariri, 63000-000 Juazeiro do Norte, CE, Brazil;1. School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei, 230009, China;2. Beijing Engineering Research Center of Optoelectronic Information and Instrument, Beijing Key Laboratory of Optoelectronics Measurement Technology, Beijing Information Science and Technology University, Beijing, 100192, China;1. Department of Chemistry and Biology and INSTM Research Unit, University of Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, SA, Italy;2. D3 CompuNet, Istituto Italiano di Tecnologia, via Morego 30, I-16163 Genova, Italy;3. Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris, F-75005 Paris, France |
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| Abstract: | This study attempts to identify and categorize turquoise stone based on its compounds and major factors that introduces its color change. Turquoise samples which are investigated in this study have been collected from the most important turquoise mines in world. Combination of two different analysis methods assists this study for scrutinizing turquoise constituents and effects of their percent on its color change. The application of infrared spectroscopy and X-Ray Fluorescence (XRF) methods can reveal the true composition of various “turquoise” samples in range of blue color to green color. Whereas the ?rst technique (FTIR) is especially capable in di? ;erentiating between natural samples and fake or simulant stones for prevent of jobbery. Changing percent of four compounds including CuO, Al2O3, P2O5 and Fe2O3, is the most effective factors of varying color in turquoise stones. In conclusion, blue turquoise stone contains great percent of light elements or blue color factors in comparison to green turquoise stone which contains jorum of heavy element. |
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| Keywords: | Natural Turquoise Fake turquoise Color Infrared spectroscopy XRF |
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