哈萨克斯坦伊特穆伦硬玉岩的宝石学特征  

The Gemological Characteristics of the Itmurun Jadeite in Kazakhstan

作　　者：梁贤 LIANG Xian(Hebei GEO University,Shijiazhuang 050031,China)

机构地区：[1]河北地质大学资源学院,河北石家庄050031

出　　处：《河北地质大学学报》2020年第3期14-18,23,共6页Journal of Hebei Geo University

基　　金：河北地质大学第十六届学生科技基金科研项目(KAZ201908);河北省在读研究生创新能力培养资助项目(CXZZSS2019110)。

摘　　要：硬玉是具有单链硅氧骨干形式的一种钠铝硅酸盐。属于单斜晶系辉石类的硬玉资源,在世界上并不多见,已发现的产地有20多个,但具有宝石学价值的大部分来自于缅甸地区,对其它产地的研究较少。文章对哈萨克斯坦卡拉干达州伊特穆伦矿区产出的硬玉进行了物理性质、化学成分特征和红外光谱分析。研究发现此地产出的硬玉矿物颗粒较粗,颜色多为浅绿色,折射率为1.658,密度为3.27。电子探针显示化学成分以SiO2、Al2O3、Na2O为主,分析为硬玉和绿辉石。通过红外光谱测试可知,1 083 cm^(-1)附近为该地硬玉岩的最强吸收峰。通过对比前人对硬玉的研究可知,研究样品的颜色是由Fe^(2+)和Cr^(3+)导致。Jadeite is a sodium aluminosilicate in the form of a single chain silicon⁃oxygen backbone.Jadeite resources belonging to the monoclinic pyroxene are rare in the world.More than 20 origins have been discovered,but most of the gemological value comes from Myanmar,and few studies have been conducted on other origins.In this paper,the physical properties,chemical composition and infrared spectra of jadeite from the Itemurun mining area,Karaganda,Kazakhstan were analyzed.It is found that the jadeite mineral particles produced here are relatively thick,with light green color,refractive index is 1􀆰658,density is 3􀆰27.Electron probe revealed that the chemical components were mainly SiO2,Al2O3 and Na2O,and jadeite and pyroxene were analyzed.Accord⁃ing to the infrared spectrum test,1083 cm⁃1 is the characteristic absorption peak of the jadeite in this area.By comparing previous studied on jadeite,it can be seen that the color of samples studied in this paper is caused by Fe2+and Cr3+.

关 键 词：硬玉 宝石学特征 哈萨克斯坦 

分 类 号：P585.2[天文地球—岩石学]