The hierarchical internal structure of labradorite

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2022-09-28 DOI:10.5194/ejm-34-393-2022

Emilia Götz, H. Kleebe, U. Kolb

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Abstract

Abstract. The different structural features of labradorite and its incommensurate atomic structure have long been in the eye of science. In this transmission electron microscopy (TEM) study, all of the structural properties of labradorite could be investigated on a single crystal with an anorthite–albite–orthoclase composition of An53.4Ab41.5Or5.1. The various properties of labradorite could thus be visualized and connected to form a hierarchical structure. Both albite and pericline twins occur in the labradorite. The size of alternating Ca-rich and Ca-poor lamellae could be measured and linked to the composition and the color of labradorescence. Furthermore, a modulation vector of 0.0580(15)a* + 0.0453(33)b* − 0.1888(28)c* with a period of 3.23 nm was determined. The results indicate an eα labradorite structure, which was achieved by forming Ca-rich and Ca-poor lamellae. The average structure and subsequently the incommensurate crystal structure were solved with a three-dimensional electron diffraction (3DED) data set acquired with automated diffraction tomography (ADT) from a single lamella. The results are in good agreement with the structure solved by X-ray diffraction and demonstrate that 3DED–ADT is suitable for solving even incommensurate structures.

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拉布拉多岩的分层内部结构

摘要拉布拉多陨石的不同结构特征及其不可通约的原子结构一直是科学界关注的焦点。在透射电子显微镜（TEM）研究中，可以在一个钙长石-钠长石-正长石位置为An53.4Ab41.5Or5.1的单晶上研究拉伯陨石的所有结构性质。因此，可以将陨石的各种性质可视化并连接起来，形成一个层次结构。钠长石和中柱晶孪晶都出现在拉伯拉多岩中。富钙和贫钙交替片层的大小可以测量，并与labradorescence的组成和颜色有关。此外，0.0580（15）a的调制矢量* + 0.0453（33）b* − 0.1888（28）c*，开胃酒3.23 nm。结果表明，形成了富钙和贫钙的拉伯拉多石结构。平均结构和随后的不通约晶体结构用三维电子衍射（3DED）数据集求解，该数据集是用自动衍射断层扫描（ADT）从单个片层获得的。结果与X射线衍射求解的结构相一致，表明3DED–ADT适用于求解均匀不公度结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

European Journal of Mineralogy 地学-矿物学

CiteScore

2.80

自引率

9.50%

发文量

审稿时长

6-12 weeks

期刊介绍： EJM was founded to reach a large audience on an international scale and also for achieving closer cooperation of European countries in the publication of scientific results. The founding societies have set themselves the task of publishing a journal of the highest standard open to all scientists performing mineralogical research in the widest sense of the term, all over the world. Contributions will therefore be published primarily in English. EJM publishes original papers, review articles and letters dealing with the mineralogical sciences s.l., primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, but also biomineralogy, environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.