海蓝宝石的宝石矿物学特征及全球产地微量元素对比分析  

Gemmological and Mineralogical Characteristics of Aquamarine and Comparative Analysis of Trace Elements from Global Origins

作　　者：申佳奇 许博 SHEN Jiaqi;XU Bo(School of Gemmology,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)珠宝学院,北京100083

出　　处：《宝石和宝石学杂志（中英文）》2024年第S01期53-57,共5页Journal of Gems & Gemmology

摘　　要：海蓝宝石是一种含Fe的宝石级蓝色绿柱石,是除祖母绿外绿柱石族的第二大宝石。近年来,海蓝宝石在市场上受到越来越多珠宝商的追捧和消费者的青睐,成为价格涨幅最高的宝石之一,极具经济价值和观赏价值。宝石的产地来源是影响其市场价格的重要因素之一,前人的研究内容主要集中于笼统的、单一产地海蓝宝石的颜色评价、宝石学性质以及包裹体成分等方面的探究^([1-8]),但对不同产地海蓝宝石之间的鉴别特征研究仍相对欠缺,仅有个别产地的非全面对比^([9-12])。因此,海蓝宝石的产地鉴别体系仍在探索阶段,需要更多的系统性资料和数据支撑。化学成分是产地鉴别的重要依据之一,矿物的成因探究、成矿机制及其形成环境变化等都会对其微量元素产生影响,故不同产地海蓝宝石的微量元素及其含量分析将有助于成矿过程的复写,也为产地鉴别提供更精准的数据支持。本次研究收集了全球12个产地的海蓝宝石(蓝色绿柱石)样品,如阿富汗、巴西、马达加斯加、莫桑比克、尼日利亚、纳米尼亚Erongo Volcanic Complex、巴基斯坦Skardu、越南Nghê·An、越南Thanh Hoa、中国四川雪宝顶、中国云南元阳以及中国西藏错那洞等地区(图1)。我们选取海蓝宝石样品的颜色均为浅蓝色-深蓝色,部分样品带有微弱绿色调。其中,越南、巴西样品的蓝色的饱和度高、明度适中,中国四川样品只带有轻微蓝色调,莫桑比克样品偏绿蓝色;所有海蓝宝石样品为不透明-透明,以半透明-透明为主,中国四川、莫桑比克、巴西、越南样品基本透明,莫桑比克样品的透明度较差;海蓝宝石样品的晶体粒径大小1~6 cm,具有长柱状、短柱状、板状以及致密的块状等多种形态,不同产地样品的结晶习性存在差异,如越南样品均为长柱状,尼日利亚、巴西、马达加斯加、中国西藏、中国云南样品以短柱状为�Aquamarine is aniron-bearing blue beryl,which is the second most important gemstones in the beryl family except for emeralds.In recent years,aquamarine has been increasingly favored by more and more jewelers and consumers,which has become one of the gemstones with the highest price increase,showing significant economic and ornamental value.The origins of gemstones is one of the important factors affecting its market value.Previous studies on aquamarine have predominantly focused on the assessment of colour,gemmological properties,and inclusion compositions from the single source[1-8].However,the comparative researches on the identification features of aquamarines from different origins are still lacking,with only a few non-comprehensive comparisons available for individual sources[9-12].Therefore,the origin identification system for aquamarine is still in the exploratory stage,necessitating more systematic data.The chemical composition is a crucial criterion for origin identification.The genesis of minerals,metallogenic mechanisms,and changesin the formation environment all influence trace elements and their contents.Therefore,the analysis of trace elements of aquamarines from different localities will assist in reconstructing the mineralization process and provide more accurate data for origin determination.In this study,aquamarine(blue beryl)samples from 12 localities were collected,such as Afghanistan,Brazil,Madagascar,Mozambique,Nigeria,Namibia(the Erongo Volcanic Complex),Pakistan(Skardu),Vietnam(Ngh An and Thanh Hoa),and three regions in China:Xuebaoding in Sichuan Province,Yuanyang in Yunnan Province,and Cuonadong in Xizang(Fig.1).The selected aquamarine samples range in colour from light blue to deep blue,with some showing a faint green hue.Among them,samples from Vietnam and Brazil exhibit high colour saturation and moderate brightness,while those from Sichuan Province,China display only a slight blue tint.Samples from Mozambique have a more greenish-blue colour.The transparency of the aquamarine samples

关 键 词：海蓝宝石 宝石学特征 产地鉴别 包裹体 微量元素 

分 类 号：P619.281[天文地球—矿床学] TS933.2[天文地球—地质学]