赞比亚墨绿色电气石的颜色成因初探

仲佩佩, 沈锡田

仲佩佩, 沈锡田. 赞比亚墨绿色电气石的颜色成因初探[J]. 宝石和宝石学杂志, 2017, 19(6): 7-14. DOI: 10.15964/j.cnki.027jgg.2017.06.002
引用本文: 仲佩佩, 沈锡田. 赞比亚墨绿色电气石的颜色成因初探[J]. 宝石和宝石学杂志, 2017, 19(6): 7-14. DOI: 10.15964/j.cnki.027jgg.2017.06.002
ZHONG Peipei, Andy Hsitien Shen. Colour Origin of Dark Green Tourmaline from Zambia[J]. Journal of Gems & Gemmology, 2017, 19(6): 7-14. DOI: 10.15964/j.cnki.027jgg.2017.06.002
Citation: ZHONG Peipei, Andy Hsitien Shen. Colour Origin of Dark Green Tourmaline from Zambia[J]. Journal of Gems & Gemmology, 2017, 19(6): 7-14. DOI: 10.15964/j.cnki.027jgg.2017.06.002

赞比亚墨绿色电气石的颜色成因初探

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-S201513),

详细信息
    作者简介:

    仲佩佩(1992-),女,硕士研究生,主要从事宝石学研究工作。

    通讯作者:

    沈锡田(1962-),男,教授,主要从事宝石学与矿物学研究工作。E-mail:ahshen@foxmail.com

  • 中图分类号: TS93

Colour Origin of Dark Green Tourmaline from Zambia

  • 摘要: 目前,对于绿色电气石的颜色成因仍存在争议。对赞比亚墨绿色电气石的不同方向和不同颜色区域进行LA-ICP-MS、电子探针以及偏振显微紫外-可见光谱测试,结果显示其化学成分以Al2O3和SiO2为主,还含有一定量的FeOT、MnO等杂质,其中Fe和Mn元素的质量分数较高;不同方向以及不同色带区域的微量元素的质量分数测试结果显示,赞比亚墨绿色电气石的墨绿色由Fe和Mn元素造成。偏光显微紫外-可见吸收光谱对不同色区及不同方向测试结果显示,都存在415,720 nm处吸收带,其中415 nm处吸收带主要与交换耦合Fe3+—Fe3+离子对的电荷转移、Mn2+d电子跃迁吸收有关,720 nm处吸收带主要与Fe2+—Fe3+离子对间的电荷转移跃迁有关。结果初步认为,赞比亚墨绿色电气石的主要致色成因是Fe和Mn元素致色。
    Abstract: A series of tests have been conducted on dark green tourmaline crystals from Zambia, including conventional characteristics, LA-ICP-MS, EPMA and microscopic polarized UV-Vis absorption spectra in order to fully understand their colour origin. Electron micro-probe results indicated that, mass fraction of Al2O3 and SiO2 are high in the tourmaline samples, and a certain amount of FeOT,MnO,TiO2 and Cr2O3 are contained, while FeOT is relatively higher. EPMA results showed the content of the trace element of different directions and colour zones. Dark green area contains more content of Fe. Microscopic polarized UV-Vis absorption spectra showed that all samples have strong absorption bands centered at 415 nm and 720 nm. The absorption band near 415 nm is assigned to charge transfer between Fe3+-Fe3+, as well as Mn2+. The absorption band near 720 nm is usually ascribed to the charge transfer between Fe2+-Fe3+. The intricate interplay between these two bands is the main cause of the colour that we observed.
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  • 收稿日期:  2017-05-23

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