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K2.9Rb0.1ErSi3O9: a novel, non-centrosymmetric chain silicate and its crystal structure

Published online by Cambridge University Press:  05 July 2018

M. Wierzbicka-Wieczorek ,
U. Kolitsch ,
L. Nasdala  and
E. Tillmanns
M. Wierzbicka-Wieczorek*
Affiliation:
Institute for Mineralogy and Crystallography, University of Vienna, Geocentre, Althanstr. 14, 1090 Vienna, Austria
U. Kolitsch
Affiliation:
Institute for Mineralogy and Crystallography, University of Vienna, Geocentre, Althanstr. 14, 1090 Vienna, Austria Department of Mineralogy and Petrography, Natural History Museum, Burgring 7, 1010 Vienna, Austria
L. Nasdala
Affiliation:
Institute for Mineralogy and Crystallography, University of Vienna, Geocentre, Althanstr. 14, 1090 Vienna, Austria
E. Tillmanns
Affiliation:
Institute for Mineralogy and Crystallography, University of Vienna, Geocentre, Althanstr. 14, 1090 Vienna, Austria
*
*E-mail: maria.wierzbicka-wieczorek@uni-jena.de
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Abstract

The new, non-centrosymmetric chain silicate, K2.9Rb0.1ErSi3O9, was prepared by a high-temperature flux-growth technique, and its crystal structure was determined from single-crystal X-ray intensity data (Mo-Kα, 293 K) in space P1, with a = 6.672(1), b = 6.719(1), c = 6.725(1) Å, α = 108.87(3), β = 106.72(3), γ = 107.61(3)°, V = 245.82(6) Å3, Z = 1, R(F) = 2.81%. The compound represents a novel structure type. K2.9Rb0.1ErSi3O9 is characterized by a mixed octahedral-tetrahedral framework, in which each corner of the isolated ErO6 octahedron (<Er—O> = 2.26 Å) is linked to infinite [Si3O9] chains extending approximately along [111]. This connectivity results in a microporous character with two different, narrow channels that extend parallel to [111] and [100] and host K+ cations. The atomic arrangement is strongly pseudorhombohedral. A single-crystal Raman spectrum of K2.9Rb0.1ErSi3O9 is in agreement with the low space-group symmetry. Relations to minerals and synthetic compounds based on [Si3O9] chains are discussed, revealing that the geometry of the chain in K2.9Rb0.1ErSi3O9 is similar to that in pectolite, NaCa2[HSi3O9].

Keywords

chain silicatecrystal structurepectolite
Type
Research Article
Information
Mineralogical Magazine , Volume 74 , Issue 6 , December 2010 , pp. 979 - 990
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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Footnotes

†

Present address: Institute for Geosciences, Friedrich-Schiller University Jena, Burgweg 11, 07749 Germany.

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