Carina Silke Hanser, Tobias Häger, Roman Botcharnikov
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引用次数: 0
摘要
摘要。离子在绿柱石(Be3Al2[Si6O18])晶体结构中的掺入可以通过离子对离子直接取代框架成分 Al3+、Be2+ 和 Si4+,或通过占据间隙或结构通道位点来实现。绿柱石中最常见的杂质包括过渡金属、碱和 H2O。一般认为,过渡金属 Mn、Cr 和 V 可直接取代八面体位点上的 Al,并产生颜色。同样,八面体部位也可以容纳铁而不是铝。然而,研究表明,对于铁是否也可以存在于四面体、间隙或沟槽位点仍存在争议,而且对于这些可能性存在着截然相反的假设。不过,就铁而言,不仅这些位点是否可能存在仍有争议,而且它们对绿柱石后续颜色的影响也有争议。同样,锂在通道和 Be 四面体或间隙四面体位点的存在也仍有争议。绿柱石的结构通道中是否存在两种以上的 H2O(I 型和 II 型)也不清楚。本文旨在概述文献中关于这些方面的共识和目前的争论。文章主要集中于铁离子的取代和作用以及 H2O 对通道的占据。
Incorporation and substitution of ions and H2O in the structure of beryl
Abstract. Incorporation of ions into the crystal structure of beryl (Be3Al2[Si6O18]) can take place by direct ion-to-ion substitution of the framework components Al3+, Be2+ and Si4+ or by occupation of interstitial or structural channel sites. The most common impurities in beryl include transition metals, alkalis and H2O. It is accepted that the transition metals Mn, Cr and V directly substitute for Al at the octahedral site and induce colour. Similarly, the octahedral site can host Fe instead of Al. Nevertheless, it is shown that it remains disputed whether Fe can also be present at the tetrahedral, interstitial, or channel sites, and opposing hypotheses exist regarding these possibilities. However, in the case of Fe, not only the possible occupation of these sites remains under debate, but also their influence on the subsequent colour of beryl. Similarly, the residence of Li in the channels and at the Be tetrahedral or interstitial tetrahedral sites is still under debate. The presence of more than two types of H2O (type I and type II) in the structural channels of beryl is also unclear. This article aims to give an overview on the consensus and on the current debates found in the literature regarding these aspects. It mainly concentrates on the substitution by and the role of Fe ions and on channel occupancy by H2O.
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.