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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[1] 崔云昊.天河石颜色之谜[J].地球,1985(4):27-28. [2] 樊行昭,游益彬.山西交城西榆皮天河石呈色机理的研究[J].太原理工大学学报,2004,35(1):89-91. [3] Correcher V, Garcia G J. Study of the luminescence properties of a natural amazonite[J]. Radiation Measurements, 2011, 46(9):971-974.
[4] Hofmeister A M, Rossman G R. A study of irradiation coloring of amazonite:Structurally hydrous, Pb-bearing feldspar[J]. American Mineralogist, 1985, 70(7):794-804.
[5] Petrov I, Mineeva R M, Bershov L V, et al. EPR of[Pb-Pb]3+ mixed valance pairs in amazonite-type microcline[J].American Mineralogist, 1993(70):500-510.
[6] Ostrooumov M, Banerjee A. Typomorphic features of amazonitic K-feldspa from the Keivy granitic pegmatite[J].Swiss Journal of Geosciences Supplement, 2005, 85(1):89-102.
[7] Ofredal I.Heating experiments on amazonite[J]. Mineralogical Magazine, 1957, 31(236):417-419.
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