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The crystal structure of buttgenbachite

Published online by Cambridge University Press:  05 July 2018

L. Fanfani ,
A. Nunzi ,
P. F. Zanazzi  and
A. R. Zanzari
L. Fanfani
Affiliation:
Istituto di Mineralogia, Università di Perugià, Perugia, Italy
A. Nunzi
Affiliation:
Istituto di Mineralogia, Università di Perugià, Perugia, Italy
P. F. Zanazzi
Affiliation:
Istituto di Mineralogia, Università di Perugià, Perugia, Italy
A. R. Zanzari
Affiliation:
Istituto di Mineralogia, Università di Perugià, Perugia, Italy
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Summary

The crystal structure of buttgenbachite from Likasi (Congo) was solved by a three- dimensional Patterson function, computed using intensity data collected photographically by the Weissenberg method, and refined by successive Fourier maps and least-squares refinement to an R index 0·055 for 328 independent observed reflections. The cell content resulting from the structural analysis is Cu36·6Cl6·7(NO3)2·6(OH)63·9.2·1 H2O. The space group is P63/mmc with a = 15·750 Å and c = 9·161Å. The buttgenbachite structure is not completely ordered. It consists of a rigid three-dimensional skeleton formed by Cu co-ordination polyhedra sharing edges and corners. The large channels in the framework show a zeolite-like nature; inside the channels the disorder is caused by the different orientations of nitrate groups and by the occurrence of the substitution . The crystal structure of buttgenbachite is closely related to that of connellite. The mechanism of forming an isomorphous series is discussed: the present study shows that the replacement is more complicated than was supposed in the literature.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 303 , September 1973 , pp. 264 - 270
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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References

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