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The crystal structure of galeite, Na15(SO4)5F4Cl

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 Perugia, Perugia 06100, Italy
A. Nunzi
Affiliation:
Istituto di Mineralogia, Università di Perugia, Perugia 06100, Italy
P. F. Zanazzi
Affiliation:
Istituto di Mineralogia, Università di Perugia, Perugia 06100, Italy
A. R. Zanzari
Affiliation:
Istituto di Mineralogia, Università di Perugia, Perugia 06100, Italy
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Summary

The crystal structure of galeite from Searles Lake (California) has been determined by means of X-ray diffraction data on a single crystal. A possible structure was derived from that of schairerite on the basis of chemical and lattice analogies and was confirmed by comparison of the observed diffractometric structure factors with the calculated ones. The refinement was performed by least-squares methods employing isotropic thermal parameters and assuming that atoms related by translational pseudosymmetry exhibit equal thermal parameters. The final R value is 0·09. The cell content is 3[Na15(SO4)5F4Cl]; the space group is P31m The lattice dimensions are a 12·197(4)Å, c 13·955(10) Å The marked subcell has P3m1 symmetry and a 7·042Å, c 13·955 Å. The crystal structure of galeite consists of a three-dimensional framework, formed by coordination octahedra around Na+ ions, including tetrahedral holes with sulphur atoms at the centres. The three-dimensional framework can be considered built up by five octahedral sheets (seven sheets can be recognized in schairerite and six in sulphohalite). The very close analogies occurring in the structures of galeite and schairerite are discussed.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 312 , December 1975 , pp. 357 - 361
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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References

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