Determination of Mineral Compositions of New Kinds of Imitated Turquoise by FTIR-XRD-XRF

YAN Jun; LIU Xiao-bo; WANG Ju-an; FANG Biao; LIU Pei-jun; YANG Bin-bin

doi:10.15898/j.cnki.11-2131/td.2015.05.008

2015 Vol. 34, No. 5

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Article navigation > Rock and Mineral Analysis > 2015 > 34(5): 544-549

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YAN Jun, LIU Xiao-bo, WANG Ju-an, FANG Biao, LIU Pei-jun, YANG Bin-bin. Determination of Mineral Compositions of New Kinds of Imitated Turquoise by FTIR-XRD-XRF[J]. Rock and Mineral Analysis, 2015, 34(5): 544-549. doi: 10.15898/j.cnki.11-2131/td.2015.05.008

Citation:

YAN Jun, LIU Xiao-bo, WANG Ju-an, FANG Biao, LIU Pei-jun, YANG Bin-bin. Determination of Mineral Compositions of New Kinds of Imitated Turquoise by FTIR-XRD-XRF[J]. Rock and Mineral Analysis, 2015, 34(5): 544-549. doi: 10.15898/j.cnki.11-2131/td.2015.05.008

Determination of Mineral Compositions of New Kinds of Imitated Turquoise by FTIR-XRD-XRF

1.
Zhejiang Institute of Quality Inspection Sciences, Hangzhou 310013, China
2.
Department of Material Sciences and Engineering, Zhejiang University, Hangzhou 310027, China
3.
College of Mechanical Engineering, Beihua University, Jilin 132021, China

Received Date: 08 June 2015

Revised Date: 16 July 2015

Accepted Date: 05 September 2015

Publish Date: 25 May 2015

Abstract

Abstract

Identification of turquoises and corresponding imitations is commonly determined by Fourier Transform Infrared (FTIR) Spectrometer. Previous studies have shown that imitation turquoise was mainly composed of a single mineral phase such as hemimorphite, gibbsite, variscite, hydroxyl datolite, or magnesite. Fourier Transform Infrared (FTIR) Spectroscopy, X-ray Diffraction (XRD) and X-ray Fluorescence Spectroscopy (XRF) were used to investigate new kinds of imitation turquoises in order to classify them based on their mineral compositions and the method is described in this paper. Mineral compositions, crystal phases and crystalline appearance of different types of imitation turquoises were also compared. Results show that new kinds of imitation turquoises in this study can be mainly classified into three groups. The first group is mainly composed of silicate (larnite) and carbonate (calcite). The second group is composed of mixtures of calcite and dolomite. The third group consists of silicate, and minor barium feldspar, pyroxene and quartz. The mineral compositions of new kinds of imitation turquoises were significantly different from those of traditional imitations. In other words, the mineral compositions of imitation turquoises are becoming more and more diverse and complicated, which implies a higher demand for jewelry inspection agencies and researchers.
- imitated turquoise /
- mineral composition /
- Fourier Transform Infrared Spectroscopy (FTIR) /
- X-ray Diffraction (XRD) /
- X-ray Fluorescence Spectroscopy (XRF)

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