石英质玉石的颜色分布及其微量元素分析

A study of quartzite jade's color and trace elements

石英质玉石已成为国内玉石市场上的新宠,其丰富多变的颜色是影响石英质玉石价值最主要的因素,但目前对石英质玉石的致色矿物及颜色形成机理未有深入研究。本文以安徽霍山、云南龙陵地区多种颜色的石英质玉石为研究对象,采用高分辨率显微镜、X射线荧光光谱仪、高分辨电感耦合等离子体质谱仪等仪器设备,对其颜色分布状况、主量元素和微量元素分别进行了定量测量,并对石英质玉石的颜色成因及影响因素等进行了分析。研究结果表明,以针铁矿为主要组成的铁质致色矿物质赋存于黄色石英质玉石的裂隙及石英颗粒之间,黄色石英质玉石的颜色为次生色。本次研究对石英质玉石的综合利用具有指导意义。

More and more people are interested in the quartzite jade mainly due to its rich and varied material colors. However,very limited information is known,particularly on the coloration mechanism. This paper investigated various colored quartzite jades from Huoshan of Anhui Province and Longling of Yunnan Province. The distribution of colors,major elements and trace elements were analyzed by optical microscopic techniques,X_ray fluorescence spectrometer,and ICP_MS. It is found that the colored minerals exist mainly in the fractures and the grain boundaries of fine quartz crystals. The coloration was generated during the post_crystallization stage with the assistance of the iron oxides and hydroxides minerals.