绿帘花岗岩:一种红绿相间玉石的鉴定

Identification of Epidote Granite:a Red and Green Jade

对市场流行的一种"花绿石"进行研究分析,运用肉眼和放大观察、常规宝石学测试、可见光吸收谱、红外光谱和X射线粉末衍射等测试方法,对其进行了鉴定分析。结果显示,该种玉石主要由三种不同颜色的矿物组成,其矿物颗粒粒径相差悬殊,从巨粒到细粒变化不等。从粒径大的矿物表面获得三种红外反射光谱,分别与钾长石、石英和绿帘石的标准图谱对比,发现基本吻合。通过样品的X射线粉末衍射分析,确认了三种组成矿物。综合本次鉴定研究,样品定名为碎裂绿帘花岗岩,据资料显示,与英文命名为"unakite"的玉石类似。

A popular red and green jade was analyzed by naked eye observation and magnification, gemmological routine tests, UV-Vis absorption spectrometer, infrared spectrometer and X-ray powder diffraction. It is mainly composed of minerals of three different colours, whose particles vary from giant grain to fine grain. From the surface of mineral particles of large size, three kinds of infrared reflection spectra can be obtained. The spectra are basically in agreement with the reference spectra of potassium feldspar, quartz and epidote. Through X-ray powder diffraction analysis, the mineral components of sample can be confirmed. According to the integrated identification results, the sample is cataclastic structure, which is similar to the mineral named ＂unakite＂ in literature.