The Crystal Structure of Caratiite

Herta Effenberger and Josef Zemann
Institut für Mineralogie und Kristallographie, Universität Wien, Dr. Karl Lueger-Ring 1, A-1010 Wien, Austria

Abstract: The crystal structure of caratiite, K4Cu4O2 (SO4)4MeCl (a 13.60(2), c 4.98(1) Å, Z = 2) was solved in space group I4 from single crystal data, and refined to R = 0.035 for 654Fo > 6σ(Fo). The atomic arrangement is characterized by Cu2O(SO4)2 chains parallel to [001], with Cu in (4 + 1) co-ordination and O surrounded tetrahedrally by four Cu atoms. These chains are interconnected by K atoms to a framework, the channels of which house the Me and Cl atoms. The nature of the Me atoms is not completely clear; most probably the position is half occupied by Cu, fully occupied by Na, or occupied by a mixture of the two.

Mineralogical Magazine; December 1984 v. 48; no. 349; p. 541-546; DOI: 10.1180/minmag.1984.048.349.10
© 1984, The Mineralogical Society
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