The Green Spots in Nephrite—Grossularite

Xiao-yan FENG; Mei-dong SHEN; Yong ZHANG; Tai-jin LU

2013 Vol. 32, No. 4

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Xiao-yan FENG, Mei-dong SHEN, Yong ZHANG, Tai-jin LU. The Green Spots in Nephrite—Grossularite[J]. Rock and Mineral Analysis, 2013, 32(4): 608-612.

Citation:

Xiao-yan FENG, Mei-dong SHEN, Yong ZHANG, Tai-jin LU. The Green Spots in Nephrite—Grossularite[J]. Rock and Mineral Analysis, 2013, 32(4): 608-612.

The Green Spots in Nephrite—Grossularite

1.
National Gemstone Testing Center, Beijing 100013, China
2.
National Gems & Jewelry Technology Administrative Centre, Ministry of Land and Resources, Beijing 100013, China

Received Date: 21 January 2013

Accepted Date: 05 March 2013

Abstract

Abstract

Recently, a variety of nephrite with emerald green spots appeared in the nephrite market. There is no report on the mineral composition and green spots for this type of nephrite. Under a higher magnification optical microscope, the complete crystal shape, microstructure and the distribution of the green spots in nephrite were observed. The chemical compositions and mineral phases have been identified using Raman scattering spectrometer and Energy-Dispersive X-ray Fluorescence Spectrometer (ED-XRF) techniques. It was found that the main mineral composition of nephrite is tremolite and the green spots are grossularite. The main coloring element in grossularite is Cr. Therefore, the Cr-bearing grossularite is the main reason for the green spots occurring in the nephrite. It differs from the colouration of traditional green nephrite (jasper) and Qinghai CuiqingYu. The green garnets usually have been observed in jasper, and never found previously in other varieties of nephrite. A certain number of green grossularites with crystal shapes in the nephrite is very important for the study on the origin of this nephrite deposit and the place of its origin.
- nephrite /
- grossularite /
- tremolite /
- green spot

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References

[1]	Leaming S F. Jade in British Columbia and Yukon Territory [J].Geological Survey of Canada (Special Volume),1984,29:270-273. Google Scholar
[2]	蒋壬华.和田玉[J].上海地质,1998(2): 49-58. Google Scholar
[3]	唐延龄,陈葆章,蒋壬华.中国和阗玉[M].乌鲁木齐:新疆人民出版社,1994. Google Scholar
[4]	张蓓莉.系统宝石学(第二版)[M].北京:地质出版社,2006. Google Scholar
[5]	邹天人,陈克櫵.和田玉、玛纳斯碧玉和岫岩老玉的产地特征[J].岩石矿物学杂志,2002,21(Z1): 41-49. doi: 10.3969/j.issn.1000-6524.2002.z1.008 CrossRef Google Scholar
[6]	冯晓燕,张蓓莉.青海软玉的成分及结构特征[J].宝石和宝石学杂志,2004,6(4): 7-9. Google Scholar
[7]	刘飞,余晓艳.中国软玉矿床类型及其矿物学特征[J].矿产与地质,2009,23(4): 375-380. Google Scholar
[8]	陶正章.台湾的软玉[J].矿物岩石,1992,12(4): 21-27. Google Scholar
[9]	那宝成,冷莹莹,李祥虎.软玉致色元素的研究[J].超硬材料工程,2008,20(3): 55-58. Google Scholar
[10]	李雯雯,吴瑞华.和田玉的颜色及其色度学研究[J].矿物岩石地球化学通报,1999,18(4): 418-422. Google Scholar
[11]	米玲丽.加拿大碧玉[J].宝石和宝石学杂志,2003,5(1): 10-13. Google Scholar
[12]	邹天人,郭立鹤,李维华,段玉然.和田玉、玛纳斯碧玉和岫岩老玉的拉曼光谱研究[J].岩石矿物学杂志, 2002(Z1): 72-78. doi: 10.3969/j.issn.1000-6524.2002.z1.013 CrossRef Google Scholar
[13]	范建良,刘学良,郭守国.石榴石族宝石的拉曼光谱研究及鉴别[J].应用激光,2007, 27(4): 310-313. Google Scholar
[14]	王悠然,於晓晋,邹天人,王时麒.青海软玉的致色机理研究[C]//玉石学国际学术研讨会论文集.北京:地质出版社,2011: 123-130. Google Scholar
[15]	梁祥济.钙铝榴石-钙铁系列石榴子石的特征及其交代机理[J].岩石矿物学杂志,1994,13(4): 342-352. Google Scholar