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Crystal structure of the mineral strontiodresserite from laboratory powder diffraction data

Published online by Cambridge University Press:  29 February 2012

P. S. Whitfield,
L. D. Mitchell,
Y. Le Page,
J. Margeson and
A. C. Roberts
P. S. Whitfield*
Affiliation:
Institute for Chemical Process and Environmental Technology, National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario K1A 0R6, Canada
L. D. Mitchell
Affiliation:
Institute for Research in Construction, National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario K1A 0R6, Canada
Y. Le Page
Affiliation:
Institute for Chemical Process and Environmental Technology, National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario K1A 0R6, Canada
J. Margeson
Affiliation:
Institute for Research in Construction, National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario K1A 0R6, Canada
A. C. Roberts
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
*
a)Author to whom correspondence should be addressed. Electronic mail: pamela.whitfield@nrc.gc.ca
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Abstract

The crystal structure of the mineral strontiodresserite, (Sr,Ca)Al2(CO3)2(OH)4⋅H2O, from the Francon Quarry, Montreal, Quebec, Canada, has been solved from laboratory powder diffraction data using a combination of charge-flipping and simulated annealing methods. The structure is orthorhombic in space group Pnma with a=16.0990(7), b=5.6133(3), and c=9.1804(4) Å (Z=4) and the framework of the mineral is isostructural with that of dundasite. The strontium has a coordination number of 9 and the carbonate anions form a bridge between the SrO9 polyhedra and AlO6 octahedra. The water molecule lies in a channel that runs parallel to the b axis. An ordered network of hydrogen atoms could be uniquely determined from crystal-chemical principles in the channels of strontiodresserite. Ab initio density functional theory (DFT) energy minimization of the whole structure gave results in full agreement with X-ray refinement results for nonhydrogen atoms. The stability of this model (as well as that of the corresponding model of dundasite) in the proposed Pnma space group was tested by DFT optimization in space group P1 of random small distortions of this structure. This test confirms that both minerals are isostructural, including their hydrogen-bond networks.

Keywords

mineralcharge flippingsimulated annealingRietveld refinement

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Type
Technical Articles
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Powder Diffraction , Volume 25 , Issue 4 , December 2010, pp. 322 - 328
Copyright
Copyright © Cambridge University Press 2010

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