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

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) Å{sup 3}; 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 Na{sub 12}Sr{sub 2}Ca{sub 6}Fe{sub 3}{sup 2+} Zr{sub 3}NbSi{sub 25}O{sub 72}(OH,O){sub 4}Cl(Н{sub 2}О){sub 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.

Authors:
 [1];  [2];  [3]; ;  [1]
  1. Russian Academy of Sciences, Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” (Russian Federation)
  2. Russian Academy of Sciences, Institute of Problems of Chemical Physics (Russian Federation)
  3. Russian Academy of Sciences, Vernadsky Institute of Geochemistry and Analytical Chemistry (Russian Federation)
Publication Date:
OSTI Identifier:
22758247
Resource Type:
Journal Article
Journal Name:
Crystallography Reports
Additional Journal Information:
Journal Volume: 63; Journal Issue: 3; Other Information: Copyright (c) 2018 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7745
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; ANISOTROPY; ATOMIC DISPLACEMENTS; CATIONS; CHEMICAL COMPOSITION; CHLORINE; CONCENTRATION RATIO; CRYSTAL STRUCTURE; DISTRIBUTION; INFRARED SPECTRA; PEGMATITES; RAMAN SPECTROSCOPY; SILICATE MINERALS; STRONTIUM; X-RAY DIFFRACTION

Citation Formats

Rastsvetaeva, R. K., E-mail: rast@crys.ras.ru, Chukanov, N. V., Zaitsev, V. A., Aksenov, S. M., E-mail: aks.crys@gmail.com, and Viktorova, K. A. Crystal Structure of Cl-Deficient Analogue of Taseqite from Odikhincha Massif. United States: N. p., 2018. Web. doi:10.1134/S1063774518030240.
Rastsvetaeva, R. K., E-mail: rast@crys.ras.ru, Chukanov, N. V., Zaitsev, V. A., Aksenov, S. M., E-mail: aks.crys@gmail.com, & Viktorova, K. A. Crystal Structure of Cl-Deficient Analogue of Taseqite from Odikhincha Massif. United States. doi:10.1134/S1063774518030240.
Rastsvetaeva, R. K., E-mail: rast@crys.ras.ru, Chukanov, N. V., Zaitsev, V. A., Aksenov, S. M., E-mail: aks.crys@gmail.com, and Viktorova, K. A. Tue . "Crystal Structure of Cl-Deficient Analogue of Taseqite from Odikhincha Massif". United States. doi:10.1134/S1063774518030240.
@article{osti_22758247,
title = {Crystal Structure of Cl-Deficient Analogue of Taseqite from Odikhincha Massif},
author = {Rastsvetaeva, R. K., E-mail: rast@crys.ras.ru and Chukanov, N. V. and Zaitsev, V. A. and Aksenov, S. M., E-mail: aks.crys@gmail.com and Viktorova, K. A.},
abstractNote = {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) Å{sup 3}; 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 Na{sub 12}Sr{sub 2}Ca{sub 6}Fe{sub 3}{sup 2+} Zr{sub 3}NbSi{sub 25}O{sub 72}(OH,O){sub 4}Cl(Н{sub 2}О){sub 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.},
doi = {10.1134/S1063774518030240},
journal = {Crystallography Reports},
issn = {1063-7745},
number = 3,
volume = 63,
place = {United States},
year = {2018},
month = {5}
}