Study on Mineralogy of Omphacite Jade
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摘要: 绿辉石玉或绿辉石质翡翠是由 90 %以上的绿辉石组成的基本上为一种单一矿物的玉石, 其颜色为墨绿色, 透明度高, 商业上俗称墨翠。玻璃光泽, 纤维状微晶结构, 摩氏硬度为 7,相对密度和折射率分别为 3.3 4~ 3.44和 1.667~ 1.670, 略高于翡翠。紫外荧光下呈惰性, 查尔斯滤色镜下显黑色。显微镜下观察和电子探针分析结果表明, 其成分为绿辉石。红外光谱和拉曼光谱特征也与绿辉石光谱特征一致。利用相对密度、折射率和红外光谱等特征极易将绿辉石玉与新近市场上的仿造品区分开。Abstract: Omphacite jade or omphacitic jadeite jade, commercially named Inky Black Jade, is a virtually monomineralic rock composed of more than 90% omphacite. It has the following gemmological characters: dark green colour, high transparency (sub-transparent to translucent), vitreous lustre, micro fibrous texture, 7 of hardness, 3. 34~3. 44 of specific gravity and 1. 667~1. 670 of RI. It appears black under Chelsea Colour Filter. It is inert under LW and SW ultra violet. The results of investigation under microscope and analysis of EPMA indicate that the mineral consisting of Inky Black Jade is omphacite. X-ray power diffraction and Laser Raman spectrum also reach the same conclusion. It can be easily seperated from other simulants by the characters of specific gravity, refractive index and infrared spectrum.
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Keywords:
- omphacite jade /
- mineralogical character /
- omphacite
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