Natural and synthetic compounds with krošhnkite-type chains: Review and classification

Author(s)
Michel Fleck, Uwe Kolitsch, Birgit Hertweck
Abstract

The crystal structure of krošhnkite [Na2Cu(SO4)2 ž 2 H2O], which contains infinite chains composed of CuO6 octahedra comer-linked with SO4 tetrahedra, was originally determined 1952 by Dahlman. Since then, a large number of both minerals (e.g., collinsite, fairfieldite, etc.) and synthetic compounds with closely related structures have been investigated, but the structural relation was not always recognised. In the present review we compare the structures of AnM(XO4)2 ž 2 H2O (A = mono- or divalent cation, n = 1, 2; M = di- or trivalent cation; X = penta- or hexavalent cation) compounds with krošhn-kite-type infinite chains, and propose a structural classification into six types. The rod group symmetries of the chains are compared. Furthermore, the linkage of these chains to double chains (in krausite-type compounds) and sheets (in yavapaiite-, merwinite-, bafertisite-type and similar structures) is discussed, and the occurrence of octahedral-tetrahedral chains topologically identical to those in krošhnkite (referred to as krošhnkite-type) and similar chains (referred to as krošhnkite-like) in several related compounds is pointed out.

Organisation(s)
Department of Mineralogy and Crystallography, Department of Romance Studies
Journal
Zeitschrift für Kristallographie : international journal for structural, physical, and chemical aspects of crystalline materials
Volume
217
Pages
435-443
No. of pages
9
ISSN
0044-2968
Publication date
2002
Peer reviewed
Yes
Austrian Fields of Science 2012
1051 Geology, Mineralogy
Portal url
https://ucris.univie.ac.at/portal/en/publications/natural-and-synthetic-compounds-with-krohnkitetype-chains-review-and-classification(bd34eea0-badd-4518-8b49-fa06318b6380).html