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Crystal chemistry of natural layered double hydroxides. 3. The crystal structure of Mg,Al-disordered quintinite-2H

Published online by Cambridge University Press:  05 July 2018

E. S. Zhitova ,
V. N. Yakovenchuk ,
S. V. Krivovichev ,
A. A. Zolotarev ,
Y. A. Pakhomovsky  and
G. Yu. Ivanyuk
E. S. Zhitova
Affiliation:
Department of Crystallography, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
V. N. Yakovenchuk
Affiliation:
Geological Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences, Apatity, Russia
S. V. Krivovichev*
Affiliation:
Department of Crystallography, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences, Apatity, Russia
A. A. Zolotarev
Affiliation:
Department of Crystallography, Faculty of Geology, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
Y. A. Pakhomovsky
Affiliation:
Geological Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences, Apatity, Russia
G. Yu. Ivanyuk
Affiliation:
Geological Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences, Apatity, Russia
*
*E-mail: sk@min.uni-kiel.de
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Abstract

Two crystals of Mg, Al-disordered quintinite-2H (Q1 and Q2), [Mg4Al2(OH)12](CO3)(H2O)3, from the Kovdor alkaline massif, Kola peninsula, Russia, have been characterized chemically and structurally. Both crystals have hexagonal symmetry, P63/mcm, a = 3.0455(10)/3.0446(9), c = 15.125(7)/15.178(5) Å, V = 121.49(8)/121.84(6) Å3. The structures of the two crystals have been solved by direct methods and refined to R1 = 0.046 and 0.035 on the basis of 76 and 82 unique observed reflections for Q1 and Q2, respectively. Diffraction patterns obtained using an image-plate area detector showed the almost complete absence of superstructure reflections which would be indicative of the Mg-Al ordering in metal hydroxide layers, as has been observed recently for other quintinite polytypes. The crystal structures are based on double hydroxide layers [M(OH)2] with an average disordered distribution of Mg2+ and Al3+ cations. Average <M–OH> bond lengths for the metal site are 2.017 and 2.020 Åfor Q1 and Q2, respectively, and are consistent with a highly Mg-Al disordered, average occupancy. The layer stacking sequence can be expressed as …=AC=CA=…, corresponding to a Mg-Al-disordered 2H polytype of quintinite. The observed disorder is probably the result of a relatively high temperature of formation for the Q1 and Q2 crystals compared to ordered polytypes. This suggestion is in general agreement with the previous observations which demonstrated, for the Mg-Al system, a higher-temperature regime of formation of the hexagonal (or pseudo-hexagonal in the case of quintinite-2H-3c) 2H polytype in comparison to the rhombohedral (or pseudo-rhombohedral in the case of quintinite-1M) 3R polytype.

Keywords

layered double hydroxidesquintinitecrystal structuredisorderpolytypism
Type
Research Article
Information
Mineralogical Magazine , Volume 74 , Issue 5 , October 2010 , pp. 841 - 848
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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