Crystal structure of the K, Ti analogue of ilimaussite-(Ce), (Ba,K,Na,Ca)(11-12)(REE,Fe,Th)(4)(Ti,Nb)(6)(Si6O18)(4)(OH)(12)center dot 4.5 H2O: revision of structure model and structural formula

Krivovichev, S. V., Yakovenchuk, V. N., Armbruster, T., Pakhomovskiy, Y. A. and Depmeier, W. (2003) Crystal structure of the K, Ti analogue of ilimaussite-(Ce), (Ba,K,Na,Ca)(11-12)(REE,Fe,Th)(4)(Ti,Nb)(6)(Si6O18)(4)(OH)(12)center dot 4.5 H2O: revision of structure model and structural formula Zeitschrift Fur Kristallographie, 218 (6). pp. 392-396. DOI 10.1524/zkri.218.6.392.20721.

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Abstract

The crystal structure of the K, Ti analogue of ilimaussite-(Ce), (Ba,K,Na,Ca)(11-12)(REE,Fe,Th)(4)(Ti,Nb)(6)(Si6O18)(4)(OH)(12) 4.5 H2O, from the Yukspor mountain, Khibiny massif, Kola peninsula, Russia, has been solved by direct methods and refined to R-1 = 0.077 on the basis of 1762 reflections with \F-0\ greater than or equal to 4sigmaF. The mineral is rhombohedral, R32, a 10.708(2), c = 60.073(l 1) Angstrom, V = 5965.2(17) Angstrom(3). The structure is based upon a heteropolyhedral framework that consists of layers of corner-linked polyhedra. The SiO4 tetrahedra share corners to form 6-membered rings which are further interlinked via REEO6 trigonal prisms and Tiphi(6) octahedra (phi = O, OH). The obtained structure model is different from that recently reported by Rastsvetaeva et al. (2003) which is considered incorrect.

Document Type: Article
Research affiliation: Kiel University
DOI etc.: 10.1524/zkri.218.6.392.20721
ISSN: 0044-2968
Date Deposited: 24 Jan 2012 06:34
Last Modified: 08 Oct 2012 10:35
URI: http://eprints.uni-kiel.de/id/eprint/16207

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