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Essential features of the polytypic charoite-96 structure compared to charoite-90

Published online by Cambridge University Press:  05 July 2018

I. V. Rozhdestvenskaya ,
E. Mugnaioli ,
M. Czank ,
W. Depmeier ,
U. Kolb  and
S. Merlino
I. V. Rozhdestvenskaya*
Affiliation:
Department of Crystallography, Geological Faculty, Saint Petersburg State University, University emb. 7/9, St Petersburg 199034, Russia Department of Crystallography, Institute of Geosciences, Christian-Albrechts-University, Olshausenstrasse 40, D-24098 Kiel, Germany
E. Mugnaioli
Affiliation:
Institute of Physical Chemistry, Johannes Gutenberg-University, Welderweg 11, D-55099 Mainz, Germany
M. Czank
Affiliation:
Department of Crystallography, Institute of Geosciences, Christian-Albrechts-University, Olshausenstrasse 40, D-24098 Kiel, Germany
W. Depmeier
Affiliation:
Department of Crystallography, Institute of Geosciences, Christian-Albrechts-University, Olshausenstrasse 40, D-24098 Kiel, Germany
U. Kolb
Affiliation:
Institute of Physical Chemistry, Johannes Gutenberg-University, Welderweg 11, D-55099 Mainz, Germany
S. Merlino
Affiliation:
Dipartimento di Scienze della Terra, University of Pisa, I-56126 Pisa, Italy
*
*E-mail: ivrozhdestvenska@mail.ru
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Abstract

Charoite, ideally (K,Sr,Ba,Mn)15–16(Ca,Na)32[(Si70(O,OH)180)](OH,F)4·nH20, is a rock-forming mineral from the Murun massif in Yakutia, Sakha Republic, Siberia, Russia, where it occurs in a unique alkaline intrusion. Charoite occurs as four different polytypes, which are commonly intergrown in nanocrystallme fibres. We report the structure of charoite-96 (a = 32.11(6), b = 19.77(4), c = 7.23(1) Å, β = 95.85(9)°, V = 4565(24) Å3, space group P21/m), which was solved ab initio by direct methods on the basis of 2676 unique electron diffraction reflections collected by automated diffraction tomography and refined to R1/wR2 = 0.34/0.37. The structure of charoite-96 is related to that of the charoite-90, which was also solved recently. Both structures are composed of three different types of dreier silicate chains running along [001] and separated by ribbons of edge-sharing Ca- and Na-centred octahedra. In the structure of charoite-96, adjacent blocks formed by three different silicate chains and stacked along the x axis, are shifted by a translation of 1/2 c. The shifts involve a hybrid dreier quadruple chain, [Si17O43]18– and a double dreier chain, [Si6O17]10–. In charoite-90 adjacent blocks are stacked without shifts.

Keywords

charoite polytypeselectron crystallographycrystal structure analysiselectron diffractionelectron diffraction tomography
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 6 , December 2011 , pp. 2833 - 2846
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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