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Crystal Structure of Cl-Deficient Analogue of Taseqite from Odikhincha Massif

机译：Odikhincha MaseIF的Cl型Cl缺陷型酪蛋白的晶体结构

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摘要

An eudialyte group mineral, found in pegmatites of the Odikhincha massif (the northern part of the Siberian platform), has been investigated using X-ray diffraction, IR spectroscopy, and Raman spectroscopy. The mineral is characterized by a high strontium content and a low chlorine content. It has a trigonal unit cell with the following parameters: a = 14.2700(6) A and c = 30.057(1) A; V = 5300.6(1) A(3); sp. gr. R3m. The structure has been refined to R = 0.047 in the anisotropic approximation of atomic displacements using 1697F 4 sigma(F). The idealized formula (Z = 3) was found to be Na12Sr2Ca6Fe32+Zr3NbSi25O72(OH,O)(4)Cl(H2O)(0.2). The chemical composition and structure of this mineral are close to those of taseqite; however, it differs from the holotype sample by a low chlorine content and peculiarities of cation distribution over basic structure sites. A comparative analysis of strontium-rich eudialytes has revealed their important crystallochemical feature: selective concentration of strontium in the N4 site. Thus, taseqite, along with heterophyllosilicates, may play a role of strontium concentrator in agpaitic pegmatites.
机译：在Odikhincha Massif（西伯利亚平台北部）的柚子中发现的ediaLyte群矿物质已经使用X射线衍射，红外光谱和拉曼光谱研究。矿物的特征在于高锶含量和低氯含量。它具有三角单元电池，具有以下参数：A = 14.2700（6）A和C = 30.057（1）a; v = 5300.6（1）A（3）; SP。 GR。 R3M。在使用1697F＆gt的各向异性近似的原子位移的各向异性近似下，该结构已被精制到r = 0.047; 4个西格玛（F）。发现理想的公式（Z = 3）是Na12SR2Ca6Fe32 + Zr3NBSI25O72（OH，O）（4）Cl（H 2 O）（0.2）。该矿物的化学成分和结构靠近锡氏酸盐;然而，它与全型样品与碱性结构位点的低氯含量和阳离子分布的特性不同。对富锶的漂流项的比较分析揭示了它们的重要结晶特征：N4位点中的锶的选择性浓度。因此，酸氨酸盐和杂硅酸盐可以在胚胚层中发挥锶浓缩器的作用。

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  • 来源
    《Crystallography reports》 |2018年第3期|共9页
  • 作者

    Rastsvetaeva R. K.; Chukanov N. V; Zaitsev V. A.; Aksenov S. M.; Viktorova K. A.;

  • 作者单位

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Inst Problems Chem Phys Chernogolovka 142432 Moscow Region Russia;

    Russian Acad Sci Vernadsky Inst Geochem &

    Analyt Chem Moscow 119334 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

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  • 正文语种 eng
  • 中图分类 晶体学;
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