一种仿白玉材料--含氟、铝的硅碱钙石、针硅钙石雏晶化玻璃宝石学特征

摘要

Comparative test on the samples and white jade by conventional gemmological,thin section identification, electron probe,X ray diffraction,infrared spectrum,X fluorescence test method.The results show that the sample of young crystallized glass containing a small amount of F,AL canasite and hillebrandite composition,its main composition is SiO2, followed by K,Na,Ca and alkali metal oxides, which is composed of basic glass with silica as a main component in a specific temperature conditions gradually crystallization a,its Internal characteristics , spectral characteristics is differ-ent from white jade.The characteristics of this kind of imitation jade material are as follows: no structurecolor hue unifor-mity,high hardness, low density,structurelessness under the naked eye, can carry on the conclusion of judgment by infra-red spectrum and X-ray diffraction.%通过常规宝石学、薄片鉴定、电子探针、X射线粉末衍射、红外光谱、X荧光等测试方法对样品和白玉进行对比测试。结果表明，所测样品是由一种含少量F，Al的硅碱钙石和针硅钙石组成的雏晶化玻璃，主要成分为SiO2，次为K，Na，Ca碱金属氧化物。该样品由二氧化硅为主要成分的基础玻璃在特定温度下结晶形成，其内部特征、谱学特征与白玉具较大差异。这种仿白玉材料特征为：色调均一、硬度高、密度低、肉眼下无结构，可通过红外光谱和X衍射进行判别。