蓝色蛇纹石玉的谱学特征

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

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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 Å(d₂₀₂), 1.56 Å(d₀₆₂), 1.54 Å(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.

Key words：Blue serpentine; Tian Qing Dong; Spectroscopic characteristic; Gemological characteristics; Mineralogical characteristics

Received: 2020-01-21 Accepted: 2020-05-04

ZTFLH:

P575.4

Corresponding Authors: CHEN Tao E-mail: summerjewelry@163.com

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2021)02-0643-05 OR https://www.gpxygpfx.com/EN/Y2021/V41/I02/643

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