玉髓部分宝石学品种的异同:化学、矿物学和微观结构

IF 2.8 3区 地球科学 Q2 MINERALOGY Mineralogical Magazine Pub Date : 2024-02-16 DOI:10.1180/mgm.2023.92
Sara Monico, Marco Cantaluppi, Valeria Diella, G. Diego Gatta, Ilaria Adamo, Patrizia Fumagalli, Nicoletta Marinoni
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摘要

这项研究描述了一种具有独特的不均匀蓝绿色调的玉髓新品种,这种玉髓被命名为aquaprase。这种玉髓发现于非洲,被认为是宝石贸易中的珍贵新成员。研究人员采用多种方法对其化学、矿物学和微观结构进行了研究,然后将其与绿玉髓和玛瑙(两种最受欢迎的玉髓品种)的化学、矿物学和微观结构进行了比较。光学显微镜显示,水黄玉和玛瑙的不同颜色强度区域/条带具有复杂的微观结构异质性,而绿玉髓则表现出微晶和隐晶质石英共存的较均匀性。高分辨率同步辐射 XRD 对突显水黄玉和玛瑙中各种类型 α 石英的复杂组合(晶体尺寸和/或晶胞参数不同)至关重要。显微拉曼光谱显示,这三种玉髓中均含有 α-石英和莫干石,而绿玉髓中则含有含镍的层状硅酸盐矿物--钨锰铁矿,这也是绿玉髓呈现绿色的原因。化学分析显示,玛瑙的成分很均匀,绿玉髓中的镍含量也很高。水黄玉显示出其形成环境所特有的大量微量元素(Al、Mg、Na、K、Ca、Ti、U 和 Fe)(按重量计为百万分之几),以及高含量的铬,这被认为是其蓝绿色的原因。
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Similarities and differences among selected gemmological varieties of chalcedony: chemistry, mineralogy and microstructure

This study describes a new variety of chalcedony with a unique inhomogeneous bluish green hue, named aquaprase. It was discovered in Africa and is considered to be a valuable addition to the gem trade. A multi-methodological approach was used to examine its chemistry, mineralogy and microstructure, which were then compared to those of chrysoprase and agate, two of the most popular varieties of chalcedony. Optical microscopy revealed a complex microstructural heterogeneity in the different colour intensity areas/bands of aquaprase and agate, whereas chrysoprase exhibited a more homogeneous coexistence of micro- and cryptocrystalline quartz. High-resolution synchrotron XRD was essential for highlighting the complex assemblage of various types of α-quartz in aquaprase and agate (which differ in terms of crystal size and/or cell parameters). Micro-Raman spectroscopy revealed α-quartz and moganite in all three varieties of chalcedony and the presence of the nickel-bearing layered silicate mineral, willemseite, in chrysoprase, which is responsible for its green colouration. The chemical analysis displayed a homogeneous composition of agate, as well as high levels of nickel content in the chrysoprase variety. Aquaprase showed significant amounts (ppm by weight) of trace elements (Al, Mg, Na, K, Ca, Ti, U and Fe) characteristic of its formation environment, as well as high values of Cr, which are thought to be the cause of its bluish green colouration.

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来源期刊
Mineralogical Magazine
Mineralogical Magazine 地学-矿物学
CiteScore
4.00
自引率
25.90%
发文量
104
审稿时长
6-12 weeks
期刊介绍: Mineralogical Magazine is an international journal of mineral sciences which covers the fields of mineralogy, crystallography, geochemistry, petrology, environmental geology and economic geology. The journal has been published continuously since the founding of the Mineralogical Society of Great Britain and Ireland in 1876 and is a leading journal in its field.
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