Mineral Component of Black Cyan Nephrite from Dahua, Guangxi
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摘要: 通过常规宝石学研究方法，结合X射线粉末衍射和电子探针测试，对广西大化黑青色和田玉的常规宝石学特征和矿物组成进行了测试和分析。结果表明，广西大化黑青色和田玉的相对密度范围为3.01～3.13，平均为3.08，折射率为1.61～1.63(点测)，处于和田玉标准参数范围的较大值。X射线粉末衍射结果分析显示，广西大化黑青色和田玉的主要矿物组成为阳起石，次要矿物为透长石、黄铁矿和白云石等；电子探针结果分析显示，广西大化黑青色和田玉的主要成分为阳起石，与X射线粉末衍射分析结果一致。Abstract: Gemmological characteristics and mineral components of black cyan nephrite from Dahua, Guangxi were tested and analyzed by conventional gemmological methods, X-ray powder diffraction and electronic microprobe.The results showed that the relative density of black cyan nephrite samples from Dahua, Guangxi ranges from 3.02 to 3.13, with an average of 3.08.The refractive indexes of five testing samples range from 1.62 to 1.63, which are in the larger value of the nephrite standard parameters.The X-ray powder diffraction analyses showed that the major mineral component of the five testing samples is actinolite and the minor minerals are sanidine, pyrite and dolomite.The electron microprobe showed that constituent of the five testing samples is actinolite, in accord with X-ray powder diffraction results.
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Keywords:
- nephrite /
- black cyan /
- mineral component /
- X-ray powder diffraction /
- electronic microprobe /
- Duhua, Guangxi
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