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Crystal structure of centrosymmetric 12-layer sodium-rich eudialyte

Crystal structure of centrosymmetric 12-layer sodium-rich eudialyte Abstract The structure of a new representative of the eudialyte group with the formula (Na,Sr,K)18Ca6Zr3Fe[Si25O72](OH)2Cl · H2O from the Lovozero massif (Kola Peninsula) was studied by X-ray diffraction. The trigonal unit-cell parameters are a = 14.226 Å, c = 30.339 Å, sp. gr. R \( \bar 3 \) m; the R factor is 0.045 based on 990 reflections. This sample is of interest as a sodium-rich and iron-poor mineral having a rare centrosymmetric structure, in which the M(2) site is occupied predominantly by sodium atoms. The dependence of the formation of centrosymmetric and non-centrosymmetric structures on the composition of eudialyte-group minerals was analyzed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Crystal structure of centrosymmetric 12-layer sodium-rich eudialyte

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References (5)

Publisher
Springer Journals
Copyright
2009 Pleiades Publishing, Ltd.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/s1063774509030079
Publisher site
See Article on Publisher Site

Abstract

Abstract The structure of a new representative of the eudialyte group with the formula (Na,Sr,K)18Ca6Zr3Fe[Si25O72](OH)2Cl · H2O from the Lovozero massif (Kola Peninsula) was studied by X-ray diffraction. The trigonal unit-cell parameters are a = 14.226 Å, c = 30.339 Å, sp. gr. R \( \bar 3 \) m; the R factor is 0.045 based on 990 reflections. This sample is of interest as a sodium-rich and iron-poor mineral having a rare centrosymmetric structure, in which the M(2) site is occupied predominantly by sodium atoms. The dependence of the formation of centrosymmetric and non-centrosymmetric structures on the composition of eudialyte-group minerals was analyzed.

Journal

Crystallography Reports – Springer Journals

Published: May 1, 2009

Keywords: Crystallography and Scattering Methods

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