鸡血石相似品种的矿物学及谱学研究

doi:10.3964/j.issn.1000-0593(2020)10-3179-06

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Abstract In recent years, jade species produced in Xi’an, Yunnan with a similar appearance to Chicken-blood stone appear in the gem market. The similar species of Chicken-blood stone has brought an impact on the trade market of Chicken-blood stone, and also brought challenges to the naming and testing of Chicken-blood stone. In this study, the similar species of Chicken-blood stone are studied by using X-ray powder diffraction spectrometer(XRD), scanning electron microscopy(SEM), infrared spectrometer(IR), and laser Raman spectroscopy(LRM) in order to analyze the mineralogical and spectroscopic characteristics of the similar species of Chicken-blood stone. The results are as follow: (1) According to the testing results of XRD, the “Blood” of the similar species of Chicken-blood stone is cinnabar. Quartz and dolomite are the main constituent minerals of Xi’an sample. The “Di” of Yunnan sample is composed of quartz and calcite, and contains a certain amount of aragonite. A small amount of illite was found in the similar species of Chicken-blood stone produced in two places, and a small amount of kaolinite was found in Yunnan samples. (2) SEM showed that the carbonate minerals in the similar species of Chicken-blood stone were euhedral to subhedral. Carbonate minerals are the largest of all minerals. Subhedral-anhedral quartz is distributed between carbonate minerals. Cinnabar is distributed between carbonate minerals and quartz. Fine scale-like illite crystals were observed in Xi’an samples. (3) The IR spectrum shows that a similar species of Chicken-blood stone produced in two places share the similar mineral component of quartz and carbonate mineral. All samples have a strong and wide absorption band of 1 086, 1 167 cm^-1 caused by the anti-symmetric stretching vibration of Si—O—Si, and the infrared absorption peaks of 798, 779, 694, 512 and 462 cm^-1 belonging to the symmetric stretching vibration of Si—O band. All the above absorption peaks are attributed to quartz. Infrared spectra of dolomite of 727, 881, 1 444 cm^-1 were obtained in Xi’an samples. Yunnan samples have infrared spectra of calcite of 712, 876, 1 427, 1 789 cm^-1. Calcite and dolomite are calcite group minerals. Their infrared spectra are composed of the vibration mode of carbonate ions and the lattice vibration mode. Their peak positions are slightly different, but the basic contour and assignment are the same. 712~727 cm^-1 is the in-plane bending vibration absorption peak of [CO₃]^2-, 876~881 cm^-1 is the out-plane bending vibration absorption peak of [CO₃]^2-, and the peaks of 1 427~1 444 cm^-1 are attributed to the anti-symmetric stretching vibration of [CO₃]^2-. Some samples containing clay minerals have the vibration peak of OH in the functional area of IR. (4) Raman spectrum test shows that the “Blood” of the samples from Xi’an and Yunnan is cinnabar, with a Raman shift of 254, 290, 350 cm^-1. The black mineral in Xi’an sample is stibnite with Raman shift of 147, 191, 252, 452 cm^-1. Raman spectra of “Di” accord with the results of the infrared spectrum. Samples from Xi’an and Yunnan have the characteristic Raman shift of quartz in 464 cm^-1. In Xi’an sample, there is Raman shift of dolomite of 1 097, 725, 338, 299 cm^-1while in Yunnan sample. There is Raman shift of calcite of 1 087, 713 and 282 cm^-1. Because there are clay minerals in the similar species of Chicken-blood stone, the identification of Chicken-blood stone cannot simply depend on whether it contains clay minerals.

Key words：The similar species of Chicken-blood stone; Mineralogical characteristic; IR spectra; Raman spectra

Received: 2019-09-05 Accepted: 2020-02-03

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(2020)10-3179-06 OR https://www.gpxygpfx.com/EN/Y2020/V40/I10/3179