透闪石质玉中黄玉与糖玉致色成因差异研究
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P578.955;P619.28+3

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上海市科委科研计划项目(15DZ2283200,18DZ2281300)


Study on difference of color genesis between yellow and brown tremolite jade
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    摘要:

    采用常规宝石学仪器并结合电子探针、电子顺磁共振谱及紫外-可见光谱等测试方法,对软玉中不同深浅的黄玉与糖玉样品进行了系统分析,以探讨其致色原因及其差异。分析结果表明,黄玉的致色原因主要为O2-→Fe3+的电荷转移跃迁及Fe3+6A14T2(D)跃迁,糖玉则主要由Fe3+6A14E (D)、6A14T2(D)谱项跃迁与Mn3+的Jahn-Teller效应致色。黄玉中O2-→Fe3+的电荷转移跃迁导致可见光区的412~500 nm处吸收,是形成与控制黄玉颜色的重要因素;而糖玉因含有Mn3+致使黄绿色光被吸收而显示出黄绿色的补色。此外,Fe2+—Fe3+的荷移与Fe2+5T2)+Fe3+6A1)→Fe2+5E)+Fe3+6A1)跃迁也对糖玉和黄玉的致色具有贡献。

    Abstract:

    Using conventional gemmological instruments along with electron probe microanalysis, electron paramagnetic resonance spectroscopy and ultraviolet visible spectroscopy, the samples of yellow and brown tremolite jade were studied, discussing the causes and differences of coloration elements in different dark and light samples. The main reasons for the coloration of yellow tremolite jade are the charge transfer transition of O2-→Fe3+and the 6A14T2(D) transition of Fe3+, while the coloration of brown tremolite jade is mainly caused by 6A14E(D) and 6A14T2(D) transitions of Fe3+ and Jahn-Teller effect of Mn3+ ions. The charge transfer transition of O2-→Fe3+ in yellow tremolite jade leads to the absorption at 412~500 nm in the visible region, which is an important factor for forming and controlling the color of yellow tremolite jade, while the yellow green light absorption caused by Mn3+ in brown tremolite jade shows the complementary color of yellow green. In addition, the charge transfer of Fe2+-Fe3+ and Fe2+(5T2)+Fe3+(6A1)→Fe2+(5E)+Fe3+(6A1) are also part of the reasons for the coloration of brown and yellow tremolite jade.

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刘奕岑,周征宇,杨萧亦,陈彦宇,阮维迪,张灵敏,2021,透闪石质玉中黄玉与糖玉致色成因差异研究[J].岩石矿物学杂志,40(6):1189~1196.

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  • 收稿日期:2020-07-24
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  • 在线发布日期: 2021-11-15
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