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The crystal structures of sjögrenite and pyroaurite

Published online by Cambridge University Press:  14 March 2018

L. Ingram  and
H. F. W. Taylor
L. Ingram
Affiliation:
Department of Chemistry, University of Aberdeen
H. F. W. Taylor
Affiliation:
Department of Chemistry, University of Aberdeen
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Summary

The crystal structures of sjögrenite and pyroaurite, two stacking modifications of approximate composition Mg6Fe2(OH)16(CO3).4H2O, have been determined by X-ray diffraction using three-dimensional methods. Sjögrenite is hexagonal, with a 3·13, c 15·66 Å, space group P63/mmc , Z = ¼; pyroaurite is rhombohedral, with aH 3·13, cH 23·49 Å, space group R3̄m or R3m, Z = ⅜. Both structures are based on brucite-like layers, with magnesium and iron distributed among the octahedral positions. The cations appear to be largely disordered, although ordered regions may occur in some crystals. Between the brucite-like layers are the water molecules and carbonate groups. These are statistically arranged, with their oxygen atoms distributed among a larger number of possible sites.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 280 , December 1967 , pp. 465 - 479
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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