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Crystal structure and formula revision of deliensite, Fe[(UO2)2(SO4)2(OH)2](H2O)7

Published online by Cambridge University Press:  05 July 2018

J. Plášil*
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, CZ-18221 Prague 8, Czech Republic
J. Hauser
Affiliation:
Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
V. Petříček
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, CZ-18221 Prague 8, Czech Republic
N. Meisser
Affiliation:
Musée de Géologie and Laboratoire des Rayons-X, Institut de Minéralogie et de Géochimie, UNIL, Anthropole, CH-1015 Lausanne-Dorigny, Switzerland
S. J. Mills
Affiliation:
Geosciences, Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia
R. Škoda
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, CZ-611 37, Brno, Czech Republic
K. Fejfarová
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, CZ-18221 Prague 8, Czech Republic
J. Čejka
Affiliation:
Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00 Prague 9 - Horní Počernice, Czech Republic
J. Sejkora
Affiliation:
Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00 Prague 9 - Horní Počernice, Czech Republic
J. Hloušek
Affiliation:
U Roháčových kasáren 24, CZ-100 00, Praha 10, Czech Republic
J.-M. Johannet
Affiliation:
Richemont, F-79250 Nueil-les-Aubiers, France
V. Machovič
Affiliation:
Institute of Chemical Technology, Prague, Technická 5, CZ-16628, Prague 6, Czech Republic Institute of Rock Structures and Mechanics ASCR, v.v.i., V Holešovičkách 41, CZ-18209, Prague 8, Czech Republic
L. Lapčák
Affiliation:
Institute of Chemical Technology, Prague, Technická 5, CZ-16628, Prague 6, Czech Republic
*

Abstract

The crystal structure of deliensite, Fe[(UO2)2(SO4)2(OH)2](H2O)7, was solved by direct methods and refined to R 1 = 6.24% for 5211 unique observed reflections [I obs > 3σ(I)],on a crystal that was found to consist of rotational and inversion (merohedral) twins, from Jeroným mine, Abertamy in the Czech Republic. The presence of four twin domains was taken into account in the refinement. The structure is orthorhombic, space group Pnn2, with unit-cellparameters a = 15.8514(9), b = 16.2478(7), c = 6.8943(3) Å, V = 1775.6(1) Å3 and Z = 4. The crystal structure of deliensite contains uranyl-sulfate sheets with a phosphuranylite topology, consisting of dimers of edge-sharing uranylpentagonal bipyramids linked by corner-sharing with sulfate tetrahedra. The sheets lie in the (100) plane and are decorated by [Fe2+O(H2O)5] octahedra; two weakly bonded H2O molecules are present in the interlayer. The [Fe2+O(H2O)5]octahedron is linked directly to the sheet via the uranyl oxygen atom. Adjacent sheets are linked by hydrogen bonds only. The sheet topology and geometrical isomerism is discussed and a comparison of the composition obtained from electron-probe microanalysis, powder-diffraction data, Ramanand infrared spectra of deliensite samples from Mas d'Alary, Lodève, France; L'Ecarpière mine, Gétigné, France; and several localities at Jáchymov, Western Bohemia, Czech Republic is made.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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