一种蓝绿组合色宝石新品种的光谱学特征研究

Spectral Characteristics of A New Type Gemstone with Blue and Green Colors

近期在缅甸市场上发现一种蓝绿组合色宝石品种,以往文献中未见提及。本论文采用常规宝石学测试手段以及红外光谱、激光拉曼光谱、紫外-可见光吸收光谱等现代测试方法对其进行了较为深入的研究。结果表明:(1)该宝石样品中蓝色和绿色部分主要矿物分别为刚玉和含铬白云母,同时两部分均含有少量硬水铝石,两部分的鳞片状闪光矿物均为白云母;(2)蓝色部分产生变色效应是因为刚玉内部少量特定比例的Cr、Fe、Ti离子共同作用导致,而绿色部分是由于在白云母中少量Cr3+类质同象替代Al3+而致色。

A new type of gemstone with blue and green colors was found recently in Myanmar market,it was hardly mentioned in previous studies. Conventional gemological tests,infrared spectrometer,Raman spectrometer and UV-Visible spectrometer were used for the research. The test results show that the main mineral components of the blue and green parts are corundum and muscovite,respectively. A small amount of diaspore present in both parts. The flake-like flash minerals in the two parts are muscovite.The color-change effect of the blue part of the sample is due to the combined function of little specific proportion of Cr,Fe,Ti ions in the corundum and the coloration of the green part is caused by a small amount of Cr3 +instead of Al3 +in muscovite.