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Crystallography Reports

, Volume 63, Issue 3, pp 349–357 | Cite as

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

  • R. K. Rastsvetaeva
  • N. V. Chukanov
  • V. A. Zaitsev
  • S. M. Aksenov
  • K. A. Viktorova
Structure of Inorganic Compounds

Abstract

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) Å and c = 30.057(1) Å; V = 5300.6(1) Å3; sp. gr. R3m. The structure has been refined to R = 0.047 in the anisotropic approximation of atomic displacements using 1697F > 4σ(F). The idealized formula (Z = 3) was found to be Na12Sr2Ca6Fe 3 2+ Zr3NbSi25O72(OH,O)4Cl(Н2О)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.

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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • R. K. Rastsvetaeva
    • 1
  • N. V. Chukanov
    • 2
  • V. A. Zaitsev
    • 3
  • S. M. Aksenov
    • 1
    • 3
  • K. A. Viktorova
    • 1
  1. 1.Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of SciencesMoscowRussia
  2. 2.Institute of Problems of Chemical PhysicsRussian Academy of SciencesChernogolovkaRussia
  3. 3.Vernadsky Institute of Geochemistry and Analytical ChemistryRussian Academy of SciencesMoscowRussia

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