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Zeitschrift für Kristallographie - Crystalline Materials

Editor-in-Chief: Pöttgen, Rainer

Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Tiekink, E. R. T.

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Volume 126, Issue 1-3


Die Kristallstruktur des Koenenits, eine Doppelschichtstruktur mit zwei inkommensurablen Teilgittern

R. Allmann / H.-H. Lohse / E. Hellner
Published Online: 2010-07-28 | DOI: https://doi.org/10.1524/zkri.1968.126.1-3.7


Koenenite 4NaCl · 4(Mg,Ca)Cl2 · 5Mg(OH)2 · 4Al(OH)3 is built up of two trigonal substructures: [Na4(Ca,Mg)2 Cl12]4− and [Mg7Al4 (OH)22]4+ (space group R[unk]m and P[unk]m1 respectively). In direction of the common c axis (c = 3 · 10.88 Å or c = 10.88 Å respectively) NaCl-like chlorine double layers (acl = 4.072 Å) alternate with brucite-like OH double layers (aOH = 3.052 Å). All possible octahedral sites are randomly occupied by the metal ions. The Cl double layers have the following rhombohedral sequence: –BCABCABC–. Evidence of a common supercell could not be found. The [100] directions of both subcells form an angle of 28.3 ± .1°. The distances Me–Cl and Me–OH are 2.79 Å and 2.02 Å respectively, the distances between the layers are Cl–Cl = 3.02 Å, OH–OH = 1.99 Å and Cl–OH = 2.94 Å. The double layers of both lattices are held together by their opposite charge and by hydrogen bonds. The reliability index for 215 independent structure factors is R = 0.056.

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Published Online: 2010-07-28

Published in Print: 1968-01-01

Citation Information: Zeitschrift für Kristallographie, Volume 126, Issue 1-3, Pages 7–22, ISSN (Online) 0044-2968, ISSN (Print) 1433-7266, DOI: https://doi.org/10.1524/zkri.1968.126.1-3.7.

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