摘要
采用常规宝石学测试、X射线粉末衍射仪、傅里叶变换红外光谱仪、偏光显微镜、拉曼光谱、显微紫外-可见光谱仪、能量型色散X射线荧光能谱仪等测试手段,对市场上粉色水钙铝榴石的宝石学特征、矿物组成及谱学特征进行了深入研究,探讨了其颜色成因。结果表明,粉色水钙铝榴石矿物组成为水钙铝榴石和符山石,主要矿物水钙铝榴石呈粒状分布,呈不同浓度的粉色;少量符山石呈纤维状分布其中,呈褐绿色。综合偏光显微观察、紫外-可见光谱测试以及X射线荧光能谱仪测试结果分析,水钙铝榴石的粉色致色原因与微量元素Fe、Mn有关,且Mn为主要致色原因。
The pink hydrogrossular samples were tested by conventional gemmological tests, X-ray powder diffraction spectrometer(XRD),Fourier infrared spectroscopy(FTIR), polarizing microscope, microscopic UV-Vis spectrometer and energy dispersive X-ray fluorescence spectrometer(EDXRF), to analyze their chemical compositions, mineral components, microstructures and possible colour origins. The results of X-ray powder diffraction test showed that the pink hydrogrossular samples are composed of hydrogrossular and vesuvianite, and the results of polarizing microscopic test showed that the main mineral hydrogrossular is in granular shape and showing different concentrations of pink by microamplification. A small amount of vesuvianite is in fibrous shape scattered in the inside of the pink hydrogrossular with the colour of brown green under the microscopic observation.According to the results of polarized light microscope, microscopic UV-Vis spectroscopy and EDXRF, the pink colour of the hydrogrossular samples is related to trace elements Fe and Mn, and Mn is the main colour cause.
作者
郑亚龙
陈美华
孙瑞祯
刘佳
王成博
ZHENG Yalong;CHEN Meihua;SUN Ruizhen;LIU Jia;WANG Chengbo(Gemmological Institute,China University of Geosciences,Wuhan 430074,China;Hubei Gems and Jewelry Engineering Technology Research Center,Wuhan 430074,China;Zhong Gong Gem Testing Center,Guangzhou 510000,China)
