绿色系列危地马拉翡翠的宝石矿物学特征研究  

Study on Gemological and Mineralogical Characteristics of Guatemala Green Jadeite Jade

作　　者：陈雨晴 毕亚楠 余晓艳[2] 吴金林 刘金海 李听 张存 CHEN Yuqing;BI Yanan;YU Xiaoyan;WU JinLin;LIU Jinhai;LI Ting;ZHANG Cun(School of Materials Science and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353;School of Gemology,China University of Geosciences Beijing,Beijing 100083;National Gemstone Testing Center Shenzhen Lab.Company Ltd.,Shenzhen 518020;Cultural Relics and Museum College,Sichuan College of Culture and Arts,Mianyang 621000)

机构地区：[1]齐鲁工业大学(山东省科学院)材料科学与工程学院,济南250353 [2]中国地质大学(北京)珠宝学院,北京100083 [3]国检中心深圳珠宝检验实验室有限公司,深圳518020 [4]四川文化艺术学院文物与博物馆学院,绵阳622150

出　　处：《中国宝玉石》2023年第6期27-35,54,共10页China Gems & Jades

基　　金：齐鲁工业大学(山东省科学院)科教产融合试点工程基础研究类项目(11240455)资助。

摘　　要：翡翠以其优质的品质,悠久的历史为大众喜爱。目前对危地马拉所产翡翠的认识存在争议与不足。本文通过手标本观察、常规宝石学实验、显微岩相学观察、电子探针显微分析、傅里叶变换红外光谱仪及激光显微拉曼光谱仪等测试手段,对危地马拉翡翠宝石学基本属性、结构及构造、化学成分和谱学特征等进行了详细表征,并与现阶段缅甸翡翠研究成果作对比。结果显示,危地马拉翡翠折射率偏高,平均为1.669,相对密度平均值为3.31。其主要组成矿物为硬玉和绿辉石。以硬玉为主要组成矿物的翡翠元素含量与缅甸翡翠存在差异,缅甸翡翠中FeO含量为0~0.19 wt.%,Na_(2)O含量处于14.33~15.00 wt.%范围内,而危地马拉翡翠FeO含量处于0.110~1.294 wt.%范围内,Na_(2)O含量变化范围为13.063~14.470 wt.%,表明危地马拉翡翠相较于缅甸翡翠表现为富Fe贫Na,指示危地马拉翡翠中所含硬玉向绿辉石转变趋势更为显著,且绿辉石化进程将影响翡翠结构。Jadeite jade is favored by the publics for its high-quality and long history.Currently,there is insufficient understanding of the jadeite jade generated in Guatemala.In this paper,the gemological characteristics,texture and structure,chemical compositions,and spectral characteristics of Guatemala jadeite jade were obtained through hand specimen observation,conventional gemological experiment,microscopic petrography,electron probe microanalysis,FTIR,as well as microscopic laser Raman spectroscopy,and compared with the current research of Myanmar jadeite jade.The results show that the refractive index of Guatemalan jadeite jade is high,with an average of 1.669.The mean specific gravity is 3.31.Moreover,the results of FTIR and EPMA reveal that the main mineral compositions of Guatemalan jadeite jade are jadeite and omphacite.However,the content of elements as the main component mineral within jadeite presents different characteristics,the FeO content of Myanmar jadeite jade ranges from 0 to 0.19 wt.%,and the Na_(2)O content ranges from 14.33 to 15.00 wt.%,while the FeO content of Guatemala jadeite jade ranges from 0.110 to 1.294 wt.%,and the Na_(2)O content ranges from 13.063 to 14.470 wt.%,which indicates that the Guatemala jadeite jade is rich in Fe and poor in Na compared with Myanmar jadeite jade.This shows that the jadeite jade contained in Guatemala jadeite jade exhibits more significant trend of transition to omphacite,and the processes of omphacite formation will affect the structure of jadeite jade.

关 键 词：翡翠 矿物组成 谱学特征 危地马拉 

分 类 号：P578.968[天文地球—矿物学]