俄罗斯碧玉的物质组成及颜色成因研究

采用傅立叶变换红外光谱、紫外可见分光光谱、X射线粉晶衍射、X射线荧光分析、偏光显微镜下观察以及电子探针等测试方法,对目前市场上较常见的软玉品种——俄罗斯碧玉进行了分析测试,主要针对其物质组成及颜色成因进行了研究。结果表明俄罗斯碧玉主要由闪石族矿物组成,颜色较浅的碧玉主要矿物为透闪石,随着颜色加深,矿物过渡为阳起石。俄罗斯碧玉中含有少量碳酸盐矿物,俄罗斯碧玉中常见的黑色点状矿物包体为铬铁矿。俄罗斯碧玉的绿色主要是由于含铁所致,绿色的深浅主要由铬含量决定。

Material composition and color origin study of Russian nephrite

Fourier transform infrared absorption spectra, UV-Visible spectra, X-ray diffraction, X-ray Fluorescence spectra, polarizing microscope and electron microprobe analysis were used to study Russian nephrite that is very common on current markets, especially its chemical composition and color causes. The results show that Russian nephrite''s main minerals are amphibole group minerals, and the light green mineral is mainly tremolite. With the gradual change of color toward darkness, the main mineral grades into actinolite. Russian nephrite contains a small amount of carbonate minerals. The black spot inclusions in the Russian nephrite is chromite. The greenness of Russian nephrite is caused mainly by iron, and the degree of the greenness is determined mainly by chromium.