| 台湾绿玉髓的颜色成因 |
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| 引用本文： | 周舟,李立平. 台湾绿玉髓的颜色成因[J]. 宝石和宝石学杂志, 2017, 19(2). DOI: 10.15964/j.cnki.027jgg.2017.02.004 |
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| 作者姓名： | 周舟 李立平 |
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| 作者单位： | 1. 绍兴市质量技术监督检测院,浙江 绍兴,312000;2. 中国地质大学珠宝学院,湖北 武汉,430074 |
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| 基金项目： | 中国地质大学(武汉)珠宝检测技术创新中心开放基金CIGTXM-S201432;文章 |
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| 摘 要： | 利用紫外-可见-近红外光谱仪、电子探针、X射线粉末衍射仪和红外光谱仪,对台湾绿玉髓的成分特征和谱学特征进行分析,着重对其致色元素及致色矿物分布特征进行研究,探讨了台湾绿玉髓的呈色机理。研究结果表明,台湾绿玉髓的颜色主要由微细的含铜矿物硅孔雀石致色。紫外-可见-近红外光谱显示570~800nm吸收峰为Cu~(2+)的~2E_g→~2T_(2g)自旋跃迁导致;电子探针面扫描测试发现台湾绿玉髓中的Cu元素分布不均匀,以杂质离子及含铜矿物形式存在;X射线粉末衍射测试结果证实了该含铜矿物为硅孔雀石;中红外光谱除显示典型石英质玉石的吸收峰外还测得硅孔雀石的吸收峰,进一步证实台湾绿玉髓中硅孔雀石的存在。
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| 关 键 词： | 绿玉髓 呈色机理 谱学特征 台湾 |
Colour Origin of Green Chalcedony from Taiwan |
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| ZHOU Zhou,LI Liping. Colour Origin of Green Chalcedony from Taiwan[J]. Journal of Gems & Gemmology, 2017, 19(2). DOI: 10.15964/j.cnki.027jgg.2017.02.004 |
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| Authors: | ZHOU Zhou LI Liping |
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| Abstract: | Chemical compositions and spectral characteristics of green chalcedony from Taiwan, China, were studied with the help of UV-Vis-NIR spectroscopy, EPMA, XRD and IR spectroscopy.The distribution of its colour-causing element and colour-causing mineral were observed by EPMA, and the coloration mechanism of green chalcedony from Taiwan was concluded.The results showed that Cu in the tiny copper mineral chrysocolla causes the green colour.The UV-Vis-NIR spectra showed that the absorption band at 570-800 nm is caused by the 2Eg→2T2g spin allowed transitions of Cu2+.EPMA tests showed Cu in green chalcedony from Taiwan distributes unevenly and exists as impurity ion and copper mineral.The result of XRD showed that the copper mineral is chrysocolla.NIR spectrum showed the absorption peaks of chrysocolla and chalcedony, which further confirmed the existence of chrysocolla in green chalcedony from Taiwan. |
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| Keywords: | green chalcedony coloration mechanism spectral characteristic Taiwan |
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