马里葡萄石的宝石学特征及颜色成因研究  

Gemmological characteristics and color genesis of Mali prehnite

作　　者：韦杨丽 于桂新 张嘉敏 刘靖娜 WEI Yangli;YU Guixin;ZHANG Jiamin;LIU Jingna(Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin 541006,China;College of Earth Sciences,Guilin University of Technology,Guilin 541006,China)

机构地区：[1]广西隐伏金属矿产勘查重点实验室,广西桂林541006 [2]桂林理工大学地球科学学院,广西桂林541006

出　　处：《超硬材料工程》2023年第3期51-56,共6页Superhard Material Engineering

基　　金：广西大学生创新训练计划项目(202210596155)。

摘　　要：通过宝石学测试仪器、电子探针、红外光谱仪、紫外可见吸收光谱仪对非洲马里地区绿色和黄色葡萄石的宝石学特征、化学成分和谱学特征进行分析和探讨。结果表明,绿色和黄色马里葡萄石具有相似的折射率和紫外荧光特征,绿色马里葡萄石的相对密度(2.90~2.93)略高于黄色马里葡萄石(2.86~2.89)。在滤色镜下,绿色马里葡萄石显示浅红-红色,黄色马里葡萄石显示黄绿色。结合化学成分和谱学特征分析可知,绿色马里葡萄石的致色元素为Fe,随着Fe含量的增加,颜色加深,黄色马里葡萄石的颜色主要由Fe^(3+)代替Al^(3+)所致。The gemmological characteristics,chemical composition and spectral characteristics of green and yellow Mali prehnite are analyzed and discussed by gemmological testing instruments,electron microprobe,infrared spectrometer and ultraviolet visible absorption spectrometer.The result shows that green and yellow Mali prehnite have similar refractive index and UV fluorescence characteristics.The relative density of green Mali prehnite(2.90-2.93)is slightly higher than that of yellow Mali prehnite(2.86-2.89).Under the color filter,green Mali prehnite shows light red and yellow Mali prehnite shows yellow green.According to the analysis of chemical composition and spectral characteristics,the coloring element of green Mali prehnite is Fe.With the increase of Fe content,the color deepens.The color of yellow Mali prehnite is mainly caused by Fe^(3+) replacing Al^(3+).

关 键 词：马里葡萄石 宝石学特征 颜色成因 Fe元素 

分 类 号：TS933[轻工技术与工程]