澳大利亚孟席斯祖母绿的光谱学特征  

Study on the spectral characteristics of the Menzies emerald from Australia

作　　者：王慧[1] 梁榕 兰延[1,2] 潘海华 艾夏 林惠锋 WANG Hui;LIANG Rong;LAN Yan;PAN Hai-hua;AI Xia;LIN Hui-feng(National Gemstone Testing Center Shenzhen Lab,Shenzhen 518026,China;NGTC Gems&Jewelry Institute of Shenzhen,Shenzhen 518026,China;National Gems&Artworks Appraisal Company Limited of Shenzhen,Shenzhen 518026,China;Shenzhen Rose Blue Jewelry Co.,Ltd.,Shenzhen 518026,China)

机构地区：[1]国家珠宝玉石质量监督检验中心深圳实验室,广东探圳518026 [2]自然资源部珠宝玉石首饰管理中心深圳珠宝研究所,广东深圳518026 [3]探圳国艺珠宝艺术品资产评估有限公司,广东深圳518026 [4]探圳市瑰蓝珍宝珠宝有限公司,广东深圳518026

出　　处：《矿物学报》2019年第6期657-663,共7页Acta Mineralogica Sinica

基　　金：NGTC科研基金项目(编号：NGTCSZ18004;NGTC2019016)

摘　　要：采用红外吸收光谱、拉曼光谱、紫外-可见-近红外吸收光谱等无损分析技术,并结合激光诱导击穿光谱和电子探针对澳大利亚孟席斯祖母绿的光谱特征、成分特征和颜色成因进行了研究。红外光谱分析显示孟席斯祖母绿具有[Si6O18]基团振动特征,其结构孔道中的Ⅱ型水吸收强于Ⅰ型水;拉曼光谱特征峰主要在323 cm、397 cm-1、685 cm-1和1067 cm-1,并可检测到142 cm-1和190 cm-1等弱散射峰;紫外-可见-近红外吸收光谱主要由Cr3+、V3+、Fe2+和Fe3+的吸收组成,其中424 nm和611 nm的吸收由Cr3+和V3+联合作用导致,644 nm、661 nm和682 nm的吸收由Cr3+产生。结合Cr2O3含量显著高于V2O3的化学成分特征,表明孟席斯祖母绿主要由Cr致色。同时将孟席斯祖母绿与云南祖母绿进行对比分析,为孟席斯祖母绿的宝石学鉴定和质量评价提供依据。The spectral characteristics,chemical composition,and coloration mechanism of emeralds from the Menzies area in Western Australian have been studied in this paper by using Infrared absorption spectroscopy,Raman spectroscopy,UV-Vis-NIR absorption spectroscopy,Laser induced breakdown spectroscopy(LIBS),and Electron probe microanalysis(EPMA).Infrared absorption spectra showed that the Menzies emerald has vibration characteristics of[Si6O18]group,with relatively high absorption intensity of the II type water comparing to that of the I type water in its structural channels.The characteristic Raman spectral peaks of the Menzies emerald are mainly located at 323 cm-1,397 cm-1,685 cm-1,and 1067 cm-1,with some detected weak scattering peaks at 142 cm-1 and 190 cm-1.The UV-Vis-NIR absorption spectra were mainly the Cr3+,V3+,Fe2+and Fe3+absorption bands in which the peaks at 424 nm and 611 nm are caused by joint action of Cr3+and V3+,and the peaks at 644 nm,661 nm and 682 nm are caused by Cr3+.EPMA data of the Menzies emerald show that its Cr2O3 content is significantly higher than its V2O3 content.The results of UV-Vis-NIR absorption spectra and EPMA show that the color of Menzies emerald was mainly produced by Cr3+.At the same time,the comparative analysis of the spectra and chemical compositions between the Menzies emerald and Yunnan emerald has been carried out in order to provide the reference for the gemological identification and quality evaluation of the Menzies emerald.

关 键 词：孟席斯祖母绿 光谱特征 化学成分 颜色成因 

分 类 号：P575[天文地球—矿物学] P579[天文地球—地质学]