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The crystal structure of kogarkoite, Na3SO4F

Published online by Cambridge University Press:  05 July 2018

L. Fanfani ,
G. Giuseppetti ,
C. Tadini  and
P. F. Zanazzi
L. Fanfani
Affiliation:
Istituto di Mineralogia, Università di Cagliari, Italy
G. Giuseppetti
Affiliation:
Istituto di Mineralogia, Università di Pavia, Italy
C. Tadini
Affiliation:
Istituto di Mineralogia, Università di Pavia, Italy
P. F. Zanazzi
Affiliation:
Istituto di Mineralogia, Università di Perugia, Italy
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Summary

The crystal structure of synthetic kogarkoite has been determined from X-ray data collected on an automatic diffractometer. The refinement was performed by a least-squares method employing anisotropic thermal parameters. The 3157 reflections with I > 3σ(I) converged to a conventional R value of 0.033. The cell content is 12 Na3SO4F, the space-group P21/m, a = 18.074, b = 6.958, c = 11.443 Å, β = 107.71°.

Kogarkoite presents a marked trigonal subcell with c′ corresponding to [102] of the monoclinic cell. The tridimensional framework can be considered built up by nine differently stacked layers of Na atoms approximately perpendicular to the c′ axis (five sheets are present in galeite, six in sulphohalite, and seven in schairerite). The very close structural relationships between these minerals are discussed.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 330 , June 1980 , pp. 753 - 759
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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