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The crystal structure of ceruleite, CuAl4[AsO4]2(OH)8(H2O)4, from Cap Garonne, France

Published online by Cambridge University Press:  28 February 2018

Stuart J. Mills ,
Andrew G. Christy  and
Georges Favreau
Stuart J. Mills*
Affiliation:
Geosciences, Museums Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia
Andrew G. Christy
Affiliation:
Queensland Museum, 122 Gerler Road, Hendra, Queensland 4011, Australia School of Earth Sciences, University of Queensland, St Lucia, Queensland 4072,Australia
Georges Favreau
Affiliation:
421 Avenue Jean Monnet, 13090 Aix-en-Provence, France
*
*E-mail: [email protected]
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Abstract

The crystal structure of ceruleite, CuAl4[AsO4]2(OH)8(H2O)4, has been solved to an R1 of 0.0307, using the world's largest crystals from the Cap Garonne mine, France. Ceruleite crystallizes in space group P21/n, with the unit cell a = 7.2000(14), b = 11.345(2), c = 9.856(2) Å, β = 105.57(3)°, V = 775.6(3) Å3 and Z = 1. Ceruleite has a unique structure that consists of Al(O,OH)6 octahedra that are sharing edges to form rhombus-shaped tetramers. AsO4 tetrahedra share two corners with one such rhombus and the other two corners with each of two other rhombi, linking them into a very open mesoporous framework. Cu(OH)2(H2O)2 squares lie in the channels and link Al4 rhombi along || b. H2O molecules are also located in the channels.

Keywords

ceruleitecrystal structuresynchrotronCap Garonne mine
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 1 , February 2018 , pp. 181 - 187
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Anthony Kampf

References

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