Colour Origin of Green Chalcedony from Taiwan
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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570~800 nm吸收峰为Cu2+的2Eg→2T2g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。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 the2Eg→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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