云南“石林彩玉”的产状及宝石学特征
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摘要
"石林彩玉"是云南省石林县近年来新发现的一种玉石新品种,具有多彩的颜色和花纹。通过产地的实地考察表明,石林彩玉的矿床类型多,分布较广,而经济价值最高的是第四纪河流冲积砾石型矿床。采用常规宝石学测试、偏光显微镜薄片观察、X射线荧光分析、红外光谱分析、拉曼光谱分析、X射线粉末衍射分析等测试方法,对"石林彩玉"进行测试,结果表明:"石林彩玉"属于隐晶质-纤维状结构的石英质玉,主要矿物成分为二氧化硅,含少量斜硅石、赤铁矿、针铁矿、绿泥石等矿物。石林彩玉中Si的质量分数在85%以上,另外含少量的Cu、K、Ca、Ti、Mn、Ba等杂质元素。"石林彩玉"的主要矿物组成及光谱学特征可用于区别其他相似宝玉石(南红玛瑙、战国红玛瑙等),可为"石林彩玉"的检测与鉴定提供借鉴依据。
"Shilin Caiyu" is a kind of new varieties of jade found in recent years in Shilin county of Yunnan Province,with colorful patterns and colours.The origin investigation shows that "Shilin caiyu" deposit has many types and widely distributed and the highest economic value is the Quaternary alluvial gravel type deposit.By using conventional gemmological methods,polarizing microscope observation of thin sections,infrared spectroscopy,Xray fluorescence,Raman spectroscopy and X-ray power diffraction test,the samples were analyzed.The results showed that the "Shilin Caiyu" samples belong to fiber-shaped structure of cryptocrystalline quartz jade,and the main mineral components were silicon dioxide,containing a small amount of moganite,hematite,goethite,chlorite,etc.X-ray fluorescence spectrum analysis showed that the Si content of the samples is more than 85%,with a small amount of Cu,K,Ca,Ti,Mn,Ba.The main mineral component and spectroscopic charac-teristic of the samples were different from the other similar gems,which can provide a reference for the identification of Shilin Caiyu.
"Shilin Caiyu" is a kind of new varieties of jade found in recent years in Shilin county of Yunnan Province,with colorful patterns and colours.The origin investigation shows that "Shilin caiyu" deposit has many types and widely distributed and the highest economic value is the Quaternary alluvial gravel type deposit.By using conventional gemmological methods,polarizing microscope observation of thin sections,infrared spectroscopy,Xray fluorescence,Raman spectroscopy and X-ray power diffraction test,the samples were analyzed.The results showed that the "Shilin Caiyu" samples belong to fiber-shaped structure of cryptocrystalline quartz jade,and the main mineral components were silicon dioxide,containing a small amount of moganite,hematite,goethite,chlorite,etc.X-ray fluorescence spectrum analysis showed that the Si content of the samples is more than 85%,with a small amount of Cu,K,Ca,Ti,Mn,Ba.The main mineral component and spectroscopic charac-teristic of the samples were different from the other similar gems,which can provide a reference for the identification of Shilin Caiyu.
引文