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The crystal structure of nabokoite, Cu7TeO4(SO4)5 · KCl: The first example of a Te(IV)O4 pyramid with exactly tetragonal symmetry

Die Kristallstruktur des Nabokoits, Cu7TeO4(SO4)5 · KCl: Das erste Beispiel für eine Te(IV)O4-Pyramide mit exakt tetragonaler Symmetrie

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Summary

The crystal structure of the tetragonal fumarole mineral nabokoite, Cu7TeO4(SO4)5 · KCl (a=9.833 (1).Å,c=20.591(2) Å, space groupP 4/ncc, Z=4) was determined by single crystal X-ray methods on type material from Kamchatka. The structure contains complicated {[CU7TeO4(SO4)4]SO4} sheets that are intercalated by K and Cl ions. Nabokoite presents the first example of a Te(IV)O4 pyramid with exactly tetragonal symmetry. The K ions have a somewhat unusual, rather flat coordination.

Zusammenfassung

Die Kristallstruktur des tetragonalen Fumarolenminerals Nabokoit, Cu7TeO4(SO4)5 · KCl (a=9,833(1)Å,c=20,591(2)Å, RaumgruppeP 4/ncc, Z=4) wurde an Typ-Material von Kamtschatka mit Röntgen-Einkristallmethoden bestimmt. Die Struktur enthält komplizierte [Cu7TeO4(SO4)4]SO4-Schichten, die durch K- und Cl-Ionen verbunden werden. Nabokoit liefert das erste Beispiel für eine Te(IV)O4-Pyramide mit exakt tetragonaler Symmetrie. Die K-Ionen haben eine etwas ungewöhnliche, ziemlich flache Koordination.

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  1. Institut für Mineralogie und Kristallographie, Universität Wien, Dr. Karl Lueger-Ring 1, A-1010, Wien, Austria

    F. Pertlik &  J. Zemann

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  1. F. Pertlik
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  2. J. Zemann
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Pertlik, F., Zemann, J. The crystal structure of nabokoite, Cu7TeO4(SO4)5 · KCl: The first example of a Te(IV)O4 pyramid with exactly tetragonal symmetry. Mineralogy and Petrology 38, 291–298 (1988). https://doi.org/10.1007/BF01167095

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