单一及多组分混合物绿松石仿制品的光谱学特征研究  

Study on Spectral Characteristics of Turquoise Imitations of Single and Multiple Component Mixtures

作　　者：杨池玉 汪田田 张维肖 汤维茜 YANG Chi-yu;WANG Tian-tian;ZHANG Wei-xiao;TANG Wei-xi(Tongji Zhejiang College,Jiaxing 314051,China)

机构地区：[1]同济大学浙江学院,浙江嘉兴314051

出　　处：《光谱学与光谱分析》2025年第1期183-190,共8页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(49772096,41272049);浙江省十四五规划教改项目(JG20220716);同济大学浙江学院科研项目(KY0221523);教改项目(KCJS24007)资助。

摘　　要：对市场新出现的一类仿制品进行了拉曼光谱、红外光谱、化学成分、紫外-可见-近红外吸收光谱分析,对其主要谱学特征进行了归纳总结。结果表明这类仿制品主要由重晶石、三水铝石、方解石粉末单一组分或多组分混合压制再经环氧树脂类或丙烯酸酯类有机物胶结,并经人工染剂染色而成。红外光谱显示:单一矿物组分仿制品和绿松石差异明显,重晶石仿制品显示[SO_(4)]^(2-)的1078 cm^(-1)吸收峰等,方解石仿制品显示[CO_(3)]^(2-)的1476±cm^(-1)吸收峰等;多组分仿制品可见综合了多种矿物特征的吸收光谱,谱学特征复杂。根据缺失水峰,或仅显示三水铝石结构水OH-导致的3623、3528、3472和3388 cm^(-1)吸收峰,指纹区显示[SO_(4)]^(2-)、[CO_(3)]^(2-)相关吸收峰,可初步区分于绿松石。显微拉曼光谱测试结果表明多组分仿制品的不同测试位置矿物组成不同,可分别测试到三水铝石(3360、3432、3522、3614 cm^(-1))、重晶石(989 cm^(-1))、方解石(1088 cm^(-1))的特征峰,结合显微拉曼光谱及化学分析结果可进一步确认仿制品的具体矿物组成。紫外-可见-近红外吸收光谱表明样品均经人工染剂染色,显示633±、713±nm吸收宽峰或610±、675±nm吸收宽峰。Raman spectra,infrared spectra,chemical composition analysis,and UV-Vis NIR spectra analysis were carried out for new turquoise imitations in gem wholesale markets.The main spectral characteristics were summarized.The results show that the imitations are mainly composed of a single component or multiple mixed components of barite,gibbsite,and calcite powder,which are pressed,cemented by epoxy resin or acrylate,and dyed.The infrared spectra results are as follows:The imitations of a single mineral component are significantly different from turquoise.The imitation of barite shows a 1078 cm^(-1)absorption peak caused by[SO_(4)]^(2-)asymmetric stretching vibration and the imitation of calcite shows a 1476±cm^(-1)absorption peak caused by[CO_(3)]^(2-)symmetric stretching vibration.The multi-component imitations can be seen to integrate the absorption spectra of various mineral characteristics,the spectral characteristics are complex.According to the missing water peak,or only showing the absorption peaks of 3623,3528,3472,and 3388 cm^(-1)caused by the stretching vibration of OH-of gibbsite,and there are[SO_(4)]^(2-)and[CO_(3)]^(2-)groups correlated absorption peaks in the fingerprint region,we can roughly distinguish the imitations from turquoises.The micro-Raman spectra show that the mineral compositions of the multi-component imitations are different at different test locations,and the characteristic peaks of gibbsite(3360,3432,3522,3614 cm^(-1)),barite(989 cm^(-1))and calcite(1088 cm^(-1))can be measured respectively.Combined with the results of micro-Raman spectra and chemical analysis,the specific mineral composition of the imitation product can be further confirmed.The UV-Vis-NIR spectra show that the samples are dyed and showed 633±nm,713±nm or 610±nm,and 675±nm broad absorption peaks.

关 键 词：三水铝石 重晶石 方解石 振动光谱 微区分析 

分 类 号：P575.4[天文地球—矿物学]