中国河南和菲律宾独山玉的显微特征对比

Microscopic Characteristic Comparison of Dushan Yu from Henan Province, China and Philippines

  • 摘要: 目前市场上出现了菲律宾产出的成分与中国河南独山玉基本一致的玉石品种,颜色有白色、粉色、绿色和黑色等。运用常规宝石学测试以及偏光显微镜,对两产地独山玉的基本特征进行了对比分析,系统全面分析了独山玉的显微特征、矿物组成及结构特征。结果显示,两个产地样品均为亮玻璃光泽—玻璃光泽,半透明-不透明,大部分样品具有红色荧光,而菲律宾独山玉荧光更强,河南独山玉的折射率为1.55~1.71,相对密度为2.822~3.277,菲律宾独山玉的折射率为1.54~1.58,相对密度为2.663~2.927,中国河南的样品以粒状变晶结构为主,粒度相对较小,大部分矿物发生交代作用,而菲律宾独山玉以斑状变晶结构为主,粒度相对较大,矿物比较新鲜;两个产地样品的主要矿物都是斜长石,但是次要矿物和副矿物存在一定的差异,两个产地样品都含有绿帘石、铬铁矿和榍石,但是菲律宾独山玉以绿色钙铬榴石比较典型,中国河南独山玉阳起石、石英的含量相对较多。

     

    Abstract: At present, there is a kind of jade from Philippines appeared in the market whose components are basically the same as the Dushan Yu from Henan Province, China. The colours of the jade are white, pink, green, black, etc. The basic characteristics of the Dushan Yu from China and Philippines were compared and analyzed by conventional gemmological test, and the microscopic characteristics and structure were analyzed by polarizing microscope. The result shows that both the samples from Henan Province, China and Philippines have the bright glass luster to glass luster and translucent to opaque transparency. Most of the samples have red fluorescence, but the fluorescence is stronger in Philippines samples. The refractive index of the samples from Henan Province, China, is 1.55-1.71, and the density is 2.822-3.277, while the refractive index of the samples from Philippines is 1.54-1.58, and the density is 2.663-2.927.The samples from Henan Province, China are mainly granular metamorphism with relatively small grain size, and most of the minerals are metasomatism. The samples from Philippines are mainly porphyritic metamorphism with relatively large grain size and the minerals are relatively fresh. The major mineral is plagioclase in both samples, but there are some differences in trace minerals. Samples from both origins contain epidote, chromite and sphene, but the trace minerals in samples from Philippines are mainly green uvarovite garnet, while the samples from Henan Province, China, are more abundant in actinolite and quartz.

     

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