充填处理摩根石的谱学特征研究  

Study on the Gemmological Characteristics of Filled Morganite

作　　者：吴燕菡 陈全莉[1] 赵安迪 李璇 鲍珮瑾 WU Yan-han;CHEN Quan-li;ZHAO An-di;LI Xuan;BAO Pei-jin(Gemmological Institute,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)珠宝学院,湖北武汉430074

出　　处：《光谱学与光谱分析》2022年第2期575-581,共7页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41272053);国家重点研发计划项目(2018YFF0215400);中国地质大学(武汉)珠宝检测技术创新中心基金项目(CIGTXM-201703)资助。

摘　　要：采用常规宝石学测试方法,结合能量色散型X射线荧光光谱仪、激光拉曼光谱仪、傅里叶变换红外光谱仪、荧光光谱仪等测试分析方法,对天然及充填处理摩根石的谱学特征进行了对比研究,旨在研究充填处理摩根石的宝石学、谱学特征及探寻有效的无损鉴别充填处理摩根石的方法。结果表明,充填处理摩根石的折射率在1.57左右,略低于天然摩根石折射率;充填处理摩根石相对密度为2.71~2.76。天然摩根石在长波和短波紫外荧光下都不发光,充填处理摩根石在长波和短波紫外荧光下均显示弱至中等的白色荧光,个别样品的荧光沿裂隙分布;放大观察后,部分充填处理摩根石表面可见细网纹状开放裂隙,且在裂隙中可见充胶痕迹。能量色散型X射线荧光光谱仪测试显示天然摩根石及充填处理摩根石中均含有Si,Al,Rb和Cs等元素。天然摩根石与充填处理摩根石的激光拉曼光谱无明显差异,激光拉曼光谱仪对于区分天然摩根石与充填处理摩根石效果不明显。天然摩根石的红外光谱在1300~400 cm^(-1)间,主要为Si—O—Si环、Be—O和Al—O的基团振动;在4000~2000 cm^(-1)官能团区有CO_(2)产生的2359 cm^(-1)吸收和NaH产生的3110和3168 cm^(-1)特征吸收峰。充填处理摩根石除了摩根石本身基团振动吸收外,在2870,2930和2965 cm^(-1)普遍存在(—CH_(3)—)、(—CH_(2)—)吸收;在3035和3057 cm^(-1)存在苯环引起的吸收。三维荧光光谱图分析显示天然摩根石荧光非常弱,无特征荧光中心,相对强度在500以内;充填处理摩根石的荧光中心主要为410 nm左右的单荧光中心和440和465 nm的双荧光中心,相对强度在2000以上。充填处理摩根石的荧光中心相对强度明显高于天然摩根石,归因于充填处理过程中添加的有机胶中的芳香族化合物所致。红外吸收光谱及荧光光谱测试技术可作为区分天然摩根石和充填处理摩根石的快捷有效�Using conventional gemological methods,energy dispersive X-ray fluorescence spectrometer,laser Raman spectrometer,Fourier transform infrared spectrometer and fluorescence spectrometer to study the gemological characteristics of filled morganite and to explore effective non-destructive identification method of filling treated morganites.The results show that the refractive index of filled morganites(1.57)is slightly less than that of natural morganites.The SG values of the filled morganites range from 2.71 to 2.76.The natural morganites do not emit light under neither long-wave or short-wave UV radiation,but filled morganites show weak to medium white fluorescence under UV radiation.And the fluorescence of some samples is distributed along the fractures.After zooming in,fine reticular open cracks can be seen on the surface of partially filled morganites,and traces of glue filling can be seen in the cracks.Energy dispersive X-ray fluorescence spectrometer(EDXRF)shows Si,Al,Rb,Cs and other elements in filled morganites and natural morganites.The difference of Raman spectra between natural morganites and filled morganites is not obvious,and the effect of laser Raman spectrometer on distinguishing natural morganite and filled morganite is not obvious.The FTIR spectra of natural morganites are mainly in 1300~400 cm^(-1),which is attributed to the structural vibration of Si—O—Si ring,Be—O and Al—O;in the 4000~2000 cm^(-1) functional group region,there is 2359 cm^(-1) absorption peaks produced by CO_(2),3110 and 3168 cm^(-1)absorption peaks produced by NaH.In addition to the vibration absorption of morganite itself,the absorptions of(—CH_(3)—),(—CH_(2)—)are common at 2870,2930 and 2965 cm^(-1),filled morganites have the absorption caused by benzene ring exists at 3035 and 3057 cm^(-1).Three-dimensional fluorescence spectrometer analysis shows that the fluorescence of natural morganites is very weak,without a characteristic fluorescence center,and the relative intensity is less than 500;the fluorescence ce

关 键 词：摩根石 充填处理 红外光谱 三维荧光光谱 

分 类 号：P575.4[天文地球—矿物学]