摘要
摘 要:近年来,我国珠宝市场上各类印章石材料层出不穷,有些被当作寿山石或青田石高价售卖.选取深绿色、青白色和粉色三种颜色的印章石材料作为研究对象,采用常规宝石学测试仪器、傅里叶变换红外光谱仪、紫外-可见光分光光度计、共聚焦激光显微拉曼光谱仪、X射线粉末衍射仪、电感耦合等离子体质谱仪以及扫描电子显微镜等测试仪器对其宝石学特征、矿物组成、化学成分和形貌特征进行分析.结果表明,三种颜色印章石样品中的矿物均呈薄片状不定向分布,宝石学特征和谱学特征因其所含矿物种类的不同也存在一定差异.深绿色印章石样品主要含85％的金云母(其衍射特征峰为1.001 9、0.502 3、0.335 3、0.201 3 nm)和14.1％的滑石(其衍射特征峰0.932 0、0.458 1、0.311 2、0.2916、0.261 4、0.167 4 nm);青白色印章石样品主要含斜绿泥石(其衍射特征峰 1.419 9、0.710 9、0.473 6、0.459 1、0.354 8、0.284 1、0.253 6 nm);粉色印章石样品含97.6％的滑石和少量的蛇纹石(其衍射特征峰0.724 9、0.360 7、0.233 9、0.209 8 nm);结合化学成分和紫外-可见光谱分析其颜色成因发现,深绿色印章石样品的致色成因与Fe元素有关,是Fe3+d轨道的6A1→4T2(D)电子跃迁和Fe2+-Fe3+之间的电荷迁移的共同作用,青白色印章石的致色成因主要与Fe2+有关,Fe2+-Ti4+电荷迁移可能起到少部分贡献作用.
Abstract
In recent years,various types of seal stone materials have emerged in China's jew-elry market,and some products being sold as Shoushan stone or Qingtian stone at high prices.In this paper,the gemmological characteristics,mineral components and microstruc-ture of three types of seal stone samples with different colours including:dark-green,bluish-white and pink,were analyzed by conventional gemmological tests,Fourier transform infra-red absorption spectrometer,UV-Visible spectrophotometer,Raman spectrometer,X-ray powder diffractometer,inductively-coupled plasma mass spectrometer and scanning electron microscope.The results show that the minerals in the three types of seal stone samples are not directionally distributed in thin sheets,and the gemmological and spectroscopic charac-teristics are also different due to the various types of minerals they contain.The main miner-al components of the dark-green seal stone samples are about 85％phlogopite(the diffraction characteristic peaks are 1.001 9,0.502 3,0.335 3,0.201 3 nm)and 14.1％talc(the diffrac-tion characteristic peaks are 0.932 0,0.458 1,0.311 2,0.291 6,0.261 4,0.167 4 nm).The main mineral components of the bluish-white seal stone samples are inclined chlorite(the diffraction characteristic peaks are 1.419 9,0.710 9,0.473 6,0.459 1,0.354 8,0.284 1,0.253 6 nm).The main mineral components of the pink seal stone samples are talc and ser-pentine(the diffraction characteristic peaks are 0.724 9,0.360 7,0.233 9,0.209 8 nm).The combination of chemical compositions and UV-Visible spectra show that the colour ori-gin of dark-green seal stone is related to Fe,which is a joint action of the 6A1→ 4T2(D)elec-tron transition of the Fe3+d orbit and the charge migration between Fe2+-Fe3+;the colour origin of bluish-white seal stone is mainly related to Fe2+,and the migration of Fe2+-Ti4+charge makes a little contribution.
基金项目
上海市晨光计划(AASH2106)
上海市民办高校"民师计划"(2023-00140)
NETL
NSTL
万方数据