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Crystal structure of Na4[Cu4O2(SO4)4]·MeCl (Me: Na, Cu, ☐) – the synthetic Na-analogue of piypite (caratiite)

Published online by Cambridge University Press:  05 July 2018

V. Kahlenberg ,
A. Piotrowski  and
G. Giester
V. Kahlenberg*
Affiliation:
FB Geowissenschaften (Kristallographie), Universität Bremen, Klagenfurter Str., D-28359 Bremen, Germany
A. Piotrowski
Affiliation:
FB Geowissenschaften (Kristallographie), Universität Bremen, Klagenfurter Str., D-28359 Bremen, Germany
G. Giester
Affiliation:
Institut für Mineralogie und Kristallographie, Universität Wien, Althanstr. 14, A-1090 Wien, Austria
*
*E-mail: vkahlen@min.uni-bremen.de
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Abstract

The crystal structure of Na4[Cu4O2(SO4)4] MeCl (Me: Na,Cu,☐) has been solved by direct methods and refined to R1 = 0.028 using 2466 independent reflections. The compound is tetragonal with space group P4/n, a = 18.451(1)Å, c = 4.9520(2)Å, Z = 4. The two main building units running parallel to the c-axis comprise: (1) slabs containing SO4 and OCu4 tetrahedra; and (2) chains of corner sharing Me(Cl,O)6 octahedra. The displacement ellipsoids of the atoms occupying the Me sites and of the Cl ions indicate a short-range static disorder. Copper in the slabs exhibits a (4+1) coordination. Both elements form a tunnel structure in which additional Na atoms are incorporated for charge compensation. The structure is closely related to the mineral piypite (K4Cu4O2(SO4)4 MeCl (Me: Na,Cu,☐)): . Furthermore, the structure has a pronounced pseudo-translational symmetry: apart from some of the oxygen sites, all of the nineteen crystallographically distinct positions are related by a pseudo F centring.

Keywords

piypite (caratiite)crystal structure
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 6 , December 2000 , pp. 1099 - 1108
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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