Study on Gemmological Characteristics of Rubies from Yuanjiang, Yunnan Province
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摘要: 采用常规的宝石学研究方法以及电子探针、扫描电镜、电子顺磁共振、傅里叶变换红外光谱仪和拉曼光谱仪等现代测试仪器,对云南元江红宝石的宝石学特征进行了较全面的分析。结果表明,元江红宝石颜色丰富,裂理发育,内含有大量的包裹体,主要致色离子为Cr,随着Cr质量分数的增高,红色逐渐加深,折射率增大;其拉曼光谱在200~1 200 cm-1范围内有2~3个拉曼吸收峰,红外光谱除2 110,1 980 cm-1红外吸收双峰外,还出现381,420,647 cm-1 3个Al2O3的特征峰。Abstract: The gemmological characteristics of rubies from Yuanjiang, Yunnan Province, are analysed by using the conventional gemmological methods and the modern instruments of EMPA, scanning electron microscope, electron paramagnetic resonance, infrared Fourier transform spectroscope and laser Raman spectrometer. The results indicate that the rubies from Yuanjiang have various colour, well-developed partings, a great number of inclusions and surface contaminations. The colour of ruby is caused by Cr. With the increasing of Cr content, the red colour deepens, and the refractive index turns higher. There are 2 or 3 Raman absorption peaks in the range of 200~1 200 cm-1. In addition to the absorption peaks of 2 110, 1 980 cm-1, there are three diagnostic absorption peaks of Al2O3 at 381, 420, 647 cm-1 in IR.
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Keywords:
- ruby from Yuangjiang /
- gemmological characteristic /
- EPR /
- IR /
- Raman spectrum /
- Yunnan Province
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