三个产地海蓝宝石的宝石矿物学特征  

Gem-Mineralogical Characteristics of Aquamarine from Three Difference Origin

作　　者：崔师源 申佳奇 许博 CUI Shiyuan;SHEN Jiaqi;XU Bo(School of Gemmology,China University of Geosciences(Bejing),Bejing 100083)

机构地区：[1]中国地质大学(北京)珠宝学院,北京100083

出　　处：《中国宝玉石》2022年第4期2-8,14,共8页China Gems & Jades

摘　　要：海蓝宝石是绿柱石族矿物中的重要成员,随着优质海蓝宝石资源的减少以及世界海蓝宝石产地的增加,不同产地海蓝宝石的对比研究有着重要意义。本文选取新疆可可托海、巴西米纳斯吉拉斯、南非纳马夸兰的海蓝宝石样品,通过宏观样品观察、常规宝石学测试、紫外―可见光光谱、红外光谱、拉曼光谱、电子探针、激光等离子质谱仪等测试,对三个产地海蓝宝石的宝石矿物学特征进行了研究。紫外―可见光光谱结果表明,纳马夸兰海蓝宝石Fe含量最高,可可托海Fe含量最低。红外光谱结果显示纳马夸兰、米纳斯吉拉斯海蓝宝石中Al-O八面体替代程度较可可托海海更高。拉曼光谱显示纳马夸兰海蓝宝石的碱金属含量最高、可可托海次之、米纳斯吉拉斯最低。主量元素的测试中发现海蓝宝石中Al、Fe含量有一定的负相关性。微量元素测试中发现海蓝宝石中的碱金属含量有相似的变化趋势。通过与世界其他产地的海蓝宝石的主微量元素含量的对比,发现三个产地的海蓝宝石具有高铝、低铁、低碱金属含量的特征。Aquamarine is an important member of beryl minerals. With the decrease of high-quality aquamarine resources and the increase of aquamarine producing areas in the world, it is of great significance to compare and distinguish aquamarine from different origins. Three aquamarine samples from Koktokay, Xinjiang province, Minas Gerais, Brazil and Namaqualand, South Africa were tested in this paper. Microscopic observation, gemology measurement, UV spectroscopy, IR spectroscopy, Raman spectroscopy, electron probe, and LA-ICP-MS were used to analyze the gem-mineralogy characteristics of three samples. The results of UV-Vis spectrum show that Fe content in aquamarine from Namaqualand is the highest, and that of Koktokay aquamarine was the lowest. IR spectrum show that the degree of Al-O octahedral substitution of aquamarine from Namaqualand and Minas Gerais is higher than that of Koktokay aquamarine. Raman spectrum reveal that alkali element content in Namaqualand aquamarine is the highest, followed by Koktokay and Minas Gerais. The contents of Al and Fe in aquamarine are found to be negatively correlated by major elements analysis. Through tests for trace elements, it is found that the alkali elements in aquamarine show similar variation. By comparing the contents of major and trace elements of aquamarine from other producing areas in the world, it is found that aquamarine from the three regions has the characteristics of high aluminum, low iron and low alkali element contents.

关 键 词：海蓝宝石 宝石矿物学特征 可可托海 米纳斯吉拉斯 纳马夸兰 

分 类 号：P575[天文地球—矿物学]