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Trabzonite, Ca4[Si3O9(OH)]OH: crystal structure, revised formula, new occurrence and relation to killalaite

Published online by Cambridge University Press:  05 July 2018

T. Armbruster ,
B. Lazic ,
I. O. Galuskina ,
E. V. Galuskin ,
E. Gnos ,
K. M. Marzec  and
V. M. Gazeev
T. Armbruster*
Affiliation:
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern, Freiestr. 3, CH-3012 Bern, Switzerland
B. Lazic
Affiliation:
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern, Freiestr. 3, CH-3012 Bern, Switzerland
I. O. Galuskina
Affiliation:
Faculty of Earth Sciences, Department of Geochemistry, Mineralogy and Petrography, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
E. V. Galuskin
Affiliation:
Faculty of Earth Sciences, Department of Geochemistry, Mineralogy and Petrography, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
E. Gnos
Affiliation:
Muséum d’histoire naturelle, 1 route de Malagnou, CP 6434, CH-1211 Genéve 6, Switzerland
K. M. Marzec
Affiliation:
Jagiellonian Centre for Experimental Therapeutics, Bobrzyńskiego 14, 30-348 Cracow, Poland
V. M. Gazeev
Affiliation:
Institute of Geology of Ore Deposits, Geochemistry, Mineralogy and Petrography (IGEM) RAS, Staromonetny 35, Moscow, Russia
*
*E-mail: armbruster@krist.unibe.ch
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Abstract

The crystal structure of the rare skarn mineral trabzonite, Ca4[Si3O9(OH)]OH, from the type locality near Ikizdere, Turkey and from the Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia has been solved and refined using single-crystal X-ray data. This shows that the chemical formula should be modified from Ca4(Si3O10)˙2H2O, reported in the original trabzonite description, to an OH-bearing composition. The crystal structure, which contains Si3O10 trimers embedded in a framework of CaO6–8 polyhedra, has orthorhombic symmetry, space group Ama2, a = 20.6, b = 9.1, c = 10.3 Å. The orthorhombic A-centred cell is easily obtained by transformation from the original monoclinic cell of P21/m symmetry. The revised formula means that trabzonite and foshagite are polymorphs; foshagite has wollastonite-like silicate chains and in contrast to trabzonite it does not contain silanol groups. The structure and composition of killalaite from both localities was also studied. Single-crystal X-ray structure refinement of killalaite from the Northern Caucasus confirmed it to be non-stoichiometric with a composition between Ca6[Si2O6(OH)]2(OH)2 and Ca7[Si2O7]2(OH)2(Z = 2). Trabzonite, killalaite and dellaite form a series of modular structures which differ mainly in the degree of condensation of the SiO4 units.

Keywords

trabzonitekillalaitecrystal structureRaman spectroscopyskarn mineralogy
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 3 , June 2012 , pp. 455 - 472
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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References

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Killalaite mp CIF

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Trabzonite 1 0ma CIF

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