Article

[Vibrational spectra of black species of hetian nephrite (tremolite jade) and its color genesis].

China University of Geosciences, Beijing 100083, China.
Guang pu xue yu guang pu fen xi = Guang pu (impact factor: 0.84). 03/2012; 32(3):681-5. pp.681-5
Source: PubMed

ABSTRACT Black nephrite is a very uncommon jade type currently found only at Karakashi. In order to study the spectral characteristics and color-genetic mechanism of the black nephrite, samples collected from Karakashi were studied using EMPA, IR, Raman and XRD. The results are as follows: nephrite with different color has nearly the same major chemical compostions, while the black ones contain higher carbon; nephrite with different color has similar vibration spectrum, while the black ones show characteristic peak of graphite. It is speculated that the color of black nephrite is not only related with actinolite, but also related with the graphite inclusions. Obviously, Raman spectra is a very important nondestructive method to identify the color genesis and the origin of the black nephrite.

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Keywords

black nephrite
 
black ones
 
characteristic peak
 
color
 
color genesis
 
color-genetic mechanism
 
different color
 
EMPA
 
graphite
 
graphite inclusions
 
major chemical compostions
 
nephrite
 
nondestructive method
 
Raman
 
Raman spectra
 

Xiao-dan Yang