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Refinement of the crystal structure of lithium-bearing uvite

机译:细化含锂硫铁矿的晶体结构

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摘要

The crystal structure of a natural calcium tourmaline, i.e., uvite with a high lithium content (0.51 au per formula (aupf) at the Y site, is refined to R = 0.019, R w = 0.020, and S = 1.11. It is shown that, in nature, there exist uvites in which the charge balance in the case where the Z site is occupied by trivalent cations is provided by the replacement of part of the divalent magnesium cations at the Y site by univalent cations, divalent calcium cations at the X site by sodium cations, and univalent anions at the W site by oxygen anions. The W site is found to be split into two sites, namely, the W1 and W11 sites (the W1–W11 distance is 0.14 ?), which are partially occupied by the fluorine and oxygen anions, respectively. An analysis of the results obtained in this study and the data available in the literature on the crystal structure of uvites allows the conclusion that uvite can be considered a superspecies and that the nomenclature of this mineral group needs refinement with the use of structural data.
机译:天然钙电气石的晶体结构,即锂含量高(在Y位点上,每分子式(aupf)为0.51 au)的辉石,被精炼为R = 0.019,R w = 0.020和S = 1.11。在自然界中,存在硫铁矿,其中在Z位被三价阳离子占据的情况下,电荷平衡是通过在Y位上的部分二价镁阳离子被一价阳离子,二价钙阳离子取代而提供的。 X位为钠阳离子,W位为一价阴离子,氧阴离子被发现分为两个位,即W1和W11位(W1-W11距离为0.14?),这部分是对本研究获得的结果进行分析,并对文献中有关硫铁矿的晶体结构进行的数据分析,得出的结论是,硫铁矿可以被认为是一种超物种,并且该矿物群的命名法也可以得出结论。需要与时俱进e使用结构数据。

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