一种蓝绿色印章石的宝石学及矿物谱学特征  

Gemmological and Mineralogical Characteristic of A Kind of Blue-Green Seal Stone

作　　者：杨萧亦 刘奕岑 周征宇[1,2,3] 代顺 YANG Xiaoyi;LIU Yicen;ZHOU Zhengyu;DAI Shun(School of Ocean and Earth Science, Tongji University, Shanghai 200092, China;Laboratory of Gem and Technological Materials, Tongji University, Shanghai 200092, China;Shanghai Engineering and Technology Research Center of Gem and Material Technology, Shanghai 200092, China)

机构地区：[1]同济大学海洋与地球科学学院,上海200092 [2]同济大学宝石及工艺材料实验室,上海200092 [3]上海宝石及材料工艺工程技术研究中心,上海200092

出　　处：《宝石和宝石学杂志》2020年第6期33-41,共9页Journal of Gems & Gemmology

基　　金：上海市科委专项基金(15DZ2283200珠宝玉石标准样品库科技基础条件平台);上海市科委项目(18DZ2281300上海宝石及材料工艺工程技术研究中心)。

摘　　要：采用常规宝石学测试、偏光显微镜下观察、红外光谱、电子探针以及扫描电子显微镜测试,对市场新出现的蓝绿色印章石(商业名称“天青石”)的矿物组成、化学成分以及显微结构进行分析。结果表明,该蓝绿色印章石主要矿物组成为高岭石,常见副矿物主要有黄铁矿及硫磷铝锶石等,部分样品表面可见红褐色薄膜状附着物,为铁质矿物。电子探针测试结果表明,该蓝绿色印章石的主要化学成分为SiO2和Al2O3,微量元素Cr含量与其蓝绿色色调呈正相关性,局部出现的红黄色色团和色斑主要由铁引起。其主要为高岭石隐晶质集合体,扫描电子显微镜下矿物主要以鳞片状或假六方片状晶体的交错堆叠为主,部分呈书本状堆叠或无序堆叠,因而质地细腻油润。The mineral components,chemical compositions and microstructure of a kind of blue-green seal stones newly emerging in the market(called“Tian Tsing Stone”in market)are analyzed using conventional gemmological tests,polarizing microscope observation,FTIR,EPMA and SEM tests.The results show that the main mineral component of the blue-green seal stone is kaolinite,and the minor minerals mainly include pyrite and thiophosphorus aluminum strontite.There is a bronzing layer on the surface of some samples,which is iron mineral.EPMA test shows that the main chemical compositions of the blue-green seal stone are SiO2 and Al2O3,and the Cr element leads to a slightly blue-green tone in colour.The local red and yellow blocks in the samples are mainly caused by the iron content.The observation of SEM shows that the kaolinite minerals in the samples are mainly staggered stacks of scaly or pseudo-hexagonal plate-like crystals,and some are stacked disorderly or like books.Therefore the texture of the blue-green seal stone is fine and oily.

关 键 词：印章石 矿物组成 化学成分 显微结构 

分 类 号：TS93[轻工技术与工程]