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Zeitschrift für Kristallographie - Crystalline Materials

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The superstructure of the double layer mineral wermlandite [Mg7(Al0.57, Fe0.433+) (OH)18]2+ · [(Ca0.6, Mg0.4) (SO4)2(H2O)12]2−

J. Rius / R. Allmann
Published Online: 2010-08-25 | DOI: https://doi.org/10.1524/zkri.1984.168.1-4.133


The structure of wermlandite, [Mg7(Al0.57Fe0.43)2(OH)18]2+ [(Ca0.6, Mg0.4) (SO4)2(H2O)12]2− has been determined and refined to an R value of 7.2% based on 779 symmetry-independent reflections, of which 224 are unobserved (weighted R = 61%). The cell dimensions are a = b = 9.303(3), c = 22.57(1) Å, the space group is P[unk]c1 with Z = 2 and Dx = 1.96 cm−3.

The double layer structure of wermlandite is similar to those of pyroaurite and sjögrenite. In these compounds the excess positive charge in the brucite-like main layer is compensated by additional anions in the interlayers. Main and interlayer are connected by O – H … O hydrogen bonds ⩾ 2.91 Å. The network of hydrogen bonds could be evaluated.

The reflections of type h,k = 3n, l = 2n are especially strong and indicate the existence of an eighteenfold trigonal superstructure. The superstructure was solved using partial Fourier and Patterson syntheses.

About the article

Published Online: 2010-08-25

Published in Print: 1984

Citation Information: Zeitschrift für Kristallographie, ISSN (Online) 0044-2968, ISSN (Print) 1433-7266, DOI: https://doi.org/10.1524/zkri.1984.168.1-4.133. Export Citation

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