| 金绿宝石和变石的呈色机理 |
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| 引用本文： | 罗红宇,彭明生,廖尚宜,高利生.金绿宝石和变石的呈色机理[J].现代地质,2005,19(3):355-360. |
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| 作者姓名： | 罗红宇 彭明生 廖尚宜 高利生 |
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| 作者单位： | 1. 中山大学,地球科学系,广东,广州,510275
2. 中华人民共和国公安部,防伪产品质量监督检验中心,北京,100038 |
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| 摘 要： | 对24块世界主要产地的金绿宝石和变石进行X荧光能谱分析,得到其所含的主要微量元素分别是Fe、Ga、Ti和Fe、Cr、Ti。金绿宝石和变石各1块样品的同步辐射X荧光能谱半定量分析表明金绿宝石中Fe含量平均为17800×10-6,Cr为855×10-6;变石中Fe含量为16060×10-6,Cr含量达13333×10-6。对15个样品的可见吸收光谱进行测试及解释表明金绿宝石的可见吸收光谱是由Fe3+引起,变石的可见吸收光谱由Cr3+和Fe3+共同引起。色度学的分析和系列计算表明具有440~470nm间最大吸收和540~630nm宽吸收带的双峰形状的可见吸收光谱,可产生红—绿色的变石效应,通过向着该双峰形状的可见光谱的方向进行变石的优化处理可以获得宝石的变石效应。
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| 关 键 词： | 金绿宝石 变石 颜色 Fe3+离子 Cr3+离子 可见吸收光谱 |
| 文章编号： | 1000-8527(2005)03-0355-06 |
| 收稿时间： | 05 12 2005 12:00AM |
| 修稿时间： | 06 22 2005 12:00AM |
Mechanism of Chrysoberyl and Alexandrite Color |
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| LUO Hong-yu,PENG Ming-sheng,LIAO Shang-yi,GAO Li-sheng.Mechanism of Chrysoberyl and Alexandrite Color[J].Geoscience——Journal of Graduate School,China University of Geosciences,2005,19(3):355-360. |
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| Authors: | LUO Hong-yu PENG Ming-sheng LIAO Shang-yi GAO Li-sheng |
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| Institution: | LUO Hong-yu~ |
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| Abstract: | Twenty four chrysoberyl and alexandrite samples from the major deposits all over the world were studi- ed qualitatively by XRF and the trace elements in chrysoberyl were gotten mainly to be Fe, Ga, Ti, in alexandrite to be Fe, Cr, Ti. Half quantitative analysis of SRXRF experiments were carried out on one chrysoberyl and one alexandrite, the results indicated that in chrysoberyl Fe concentration averaged to be 17800×10~(-6), Cr 855×10~(-6); in alexandrite Fe concentration averaged to be 16060×10~(-6), Cr 13333×10~(-6); and Ga was one of the very important impurity in chrysoberyl only less than Fe concentration. Optical absorption of 15 samples indicated that the absorption of chrysoberyl was induced by Fe~(3+) ion, of alexandrite by Fe~(3+) and Cr~(3+) together. Series chromaticity calculations were processed. The calculation results indicated that the optical spectrum which had the 540-630 nm broad absorption band and the 440-470 nm maximum absorption would induce red to green color-change alexandrite effect, so the treatments of alexandrite may work in the direction of getting such a visible spectrum. |
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| Keywords: | chrysoberyl alexandrite color Fe~(3+) ion Cr~(3+) ion optical absorption |
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