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  • Received: Jan. 21, 2020

    Accepted: May. 4, 2020

    Posted: Apr. 8, 2021

    Published Online: Apr. 8, 2021

    The Author Email:

    DOI: 10.3964/j.issn.1000-0593(2021)02-0643-05

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    . Spectroscopic Characteristics of Blue Serpentine[J]. Spectroscopy and Spectral Analysis, 2021, 41(2): 643

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Spectroscopy and Spectral Analysis, Vol. 41, Issue 2, 643 (2021)

Spectroscopic Characteristics of Blue Serpentine

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    Abstract

    Recently, a new species of serpentine, which color is blue, named “Tian Qing Dong” appeared in jade market. Structure characteristics, chemical and mineral compositions have been investigated with a polarizing microscope, Scanning Electron Microscope, Laser Ablation Inductively Coupled Plasma Mass Spectrometry and X-ray powder diffraction spectrometer. Based on these measurements, spectroscopic characteristics are studied by using Fourier Transform Infrared Spectrometer, Raman spectrometer and Ultraviolet-Visible spectrometer. Results show that serpentine is scaly and interlocked into the felt structure. Besides, serpentine contains impurity mineral that is rhombohedron dolomite. Meanwhile, XRD results show characteristics diffraction peaks that are 2.53 ?(d202), 1.56 ?(d062), 1.54 ?(d060) and FTIR spectrum present characteristics absorb peaks which are 3 673, 997, 641 cm-1, they are confirmed that antigorite is the main mineral. There are 1 098 and 1 086 cm-1 of characteristics Raman shift exist which are belong to dolomite and calcite, these clues have indicated blue serpentine may be formed after the metasomatism which happened between dolomite and hydrothermal solution which contains SiO2. Chemical analysis shows that the concentration of Fe of blue serpentine is far lower than familiar species. UV-Vis results show that Fe2+→Fe3+ intervalence charge transfer (IVCT) transition generates a strong and broad absorption band which center is about 630 nm induce blue color, while Fe2+→Fe3+ IVCT transition also generate a weak absorption band which is 724 nm present green color. The spin-forbidden transition of Fe2+ and Fe3+ have generated 537 and 488 nm, and both are weak absorption that has not to contribute to present color.

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