Discussion of Colour Origin in Amazonite
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摘要: 在充分查阅了大量前人的资料的基础上，对5个天河石样品进行常规宝石学测试，并借助大型仪器对其进行深入的研究。激光剥蚀电感耦合等离子体技术测试发现，天河石的微量元素Fe、Rb和Pb的质量分数较多；显微红外光谱对结构水测试发现，在3 800～3 200 cm-1范围内显示有结构水和液态水的吸收；显微紫外-可见吸收光谱测试显示以380、625、740 nm为中心的强吸收。观察讨论天河石对可见光的吸收，结合热处理和辐照处理的结果，综合比较前人的研究结果，得出影响天河石颜色的三个吸收区域（625 nm中心、740 nm中心和380 nm中心）都是空穴缺陷造成的，与结构水并无直接的关系。Abstract: Based on the literatures, we studied gemmological characteristics of five amazonite samples, and conducted in-depth research with the help of advanced instrumentation. The contents of trace elements (Fe,Rb and Pb) were obtained by laser ablation inductively coupled plasma mass specrtrometry (LA-ICP-MS). We identified structural water and liquid water among 3 800~3 200 cm-1 using microscopic FTIR spectroscopy. We found three strong absorption centers at 380、625 nm and 740 nm by using microscopic UV-Vis spectrophotometer. Comparing the results from heat treatment and irradiation treatment, we concluded that the hole-related centers at 380, 640 nm and 725 nm caused its colour. The colour has no direct relation with the structural water.
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Keywords:
- amazonite /
- colour /
- heat treatment /
- irradiation
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