Gemmological Characteristic of Spinel Associated Colourless Sapphire

L. Jia, Diao Jingru, He Chong
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Abstract

The gemmological characteristics of a kind of sapphire that is associated with purple spinel were studied by EDXRF, Raman spectrometer, and fluorescence spectrometer. The sapphire sample contains 99.56% of Al2O3 and a certain amount of SiO2, CaO, TiO2, Fe2O3, Ga2O3, etc.Raman spectra showed that the colourless region is sapphire and the purple region is spinel; the inclusions are irregular and regular hexagonal solid graphite inclusion, gas inclusion that contains CO2, liquid inclusion that contains CH4, healing crack, etc. Fluorescence spectra showed no fluorescence in the colourless and purple substrate, and the peak positions of the fluorescence center of the luminescent part were near 440 nm and 460 nm. With the change of excitation wavelength from 365 nm to 390 nm, the red shift of the fluorescence center occurs. The relative intensity of the fluorescence center at 440 nm and 460 nm changed from strong to weak.
尖晶石伴生无色蓝宝石的宝石学特征
采用EDXRF、拉曼光谱仪和荧光光谱仪对紫尖晶石伴生蓝宝石的宝石学特征进行了研究。蓝宝石样品含有99.56%的Al2O3和一定量的SiO2、CaO、TiO2、Fe2O3、Ga2O3等,拉曼光谱显示无色区为蓝宝石,紫色区为尖晶石;夹杂物有不规则和规则的六边形固体石墨夹杂物、含CO2的气体夹杂物、含CH4的液体夹杂物、愈合裂纹等。荧光光谱显示,无色和紫色底物无荧光,发光部分荧光中心的峰位在440 nm和460 nm附近。随着激发波长从365 nm到390 nm的变化,荧光中心发生红移。荧光中心在440 nm和460 nm处的相对强度由强到弱变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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