广西河池软玉的谱学和产地特征研究

doi:10.3964/j.issn.1000-0593(2017)12-3819-09

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Abstract The nephrite which has been found in Hechi, Guangxi in the couple of years, in various colors like white, greenish white, rarely dark green and black, is gaining a growing popularity. Compared with those located in other places, the Hechi nephrite presents a greasy luster which has a dry and mostly opaque texture without “water lines”, the inclusions of which are band patterns in white or grayish white colors and dendritic patterns in brownish yellow and dark colors. That’s why it is named “dendritic jade” in market. The samples were tested by standard gemological methods, Raman spectroscopy, X-ray diffraction (XRD), and other techniques. The research results show that the RI of them is from 1.616 to 1.632, an average hydrostatic S. G. 2.895, inert under UV. The Raman spectra of jade part and white band are consistent with the standard Raman spectrum of nephrites. The main peaks are mainly 225, 370, 676, 1 029 and 3 677 cm^-1. Despite the results of the Raman and XRD showing that the white bands are nephrites, the band parts show different color and transparency with naked eyes because of different display patterns and sizes of the grains in the bands. Through test and calculation, the degree of crystallinity of research samples is 0.963 on average which is bigger than that of Xinjiang 0.843 on average and similar to that of Qinghai 0.96 on average. This means nephrites in this era crystallized well so as to make the mineral grains bigger, which indicates that the characteristics of slow cooling crystallization process. Because the crystallinity of the samples is good and grains are more irregular at the same time, the overall transparency of jade decreased. The value I_Be/I_Si of LIBS test on nephrites located in Xinjiang is 0.003～0.008, Qinghai 0, Liaoning 0.004～0.006, Korea 0.1～0.16, Russia 0.03～0.05, while that of Hechi in Guangxi is 0, similar to that of Qinghai.

Key words：Hechi Guangxi; Nephrite jade; Spectrum characteristics; Locality characteristics

Received: 2016-02-28 Accepted: 2016-06-21

ZTFLH:

K876.8

Corresponding Authors: YIN Zuo-wei E-mail: yinzuowei1025@163.com

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http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2017)12-3819-09 OR http://www.gpxygpfx.com/EN/Y2017/V37/I12/3819

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