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The crystal chemistry of the uranyl carbonate mineral grimselite, (K, Na)3Na[(UO2)(CO3)3](H2O), from Jáchymov, Czech Republic

Published online by Cambridge University Press:  05 July 2018

J. Plášil ,
K. Fejfarová ,
R. Skála ,
R. Škoda ,
N. Meisser ,
J. Hlousek ,
I. Císařová ,
M. Dušek ,
F. Veselovský  and
J. Čejka
...Show all authors
J. Plášil*
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, Praha 8, 182 21, Czech Republic Department of Geological Sciences, Masaryk University, Kotlářská 2, Brno, 611 37, Czech Republic
K. Fejfarová
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, Praha 8, 182 21, Czech Republic
R. Skála
Affiliation:
Institute of Geology ASCR, v.v.i., Rozvojová 269, Praha 6, 16500, Czech Republic
R. Škoda
Affiliation:
Department of Geological Sciences, Masaryk University, Kotlářská 2, Brno, 611 37, Czech Republic
N. Meisser
Affiliation:
Musée cantonal de géologie and Laboratoire des Rayons-X, Institut de Minéralogie et de Géochimie, Université de Lausanne, Anthropole, Lausanne-Dorigny, CH-1015, Switzerland
J. Hlousek
Affiliation:
U Roháčových kasáren 24, 100 00, Praha 10, Czech Republic
I. Císařová
Affiliation:
Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 6, Praha 2, 128 43, Czech Republic
M. Dušek
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, Praha 8, 182 21, Czech Republic
F. Veselovský
Affiliation:
Czech Geological Survey, Klárov 3, 118 21, Praha 1, Czech Republic
J. Čejka
Affiliation:
Department of Mineralogy and Petrology, National Museum, Václavské náměstí 68, Praha 1, 115 79, Czech Republic
J. Sejkora
Affiliation:
Department of Mineralogy and Petrology, National Museum, Václavské náměstí 68, Praha 1, 115 79, Czech Republic
P. Ondruš
Affiliation:
Biskupský dvů r 2, Praha 1, 11000, Czech Republic
*
*E-mail: plasil@fzu.cz
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Abstract

Two crystals of the uranyl carbonate mineral grimselite, ideally K3Na[(UO2)(CO3)3](H2O), from Jáchymov in the Czech Republic were studied by single-crystal X-ray diffraction and electron-probe microanalysis. One crystal has considerably more Na than the ideal chemical composition due to substitution of Na into KO8 polyhedra; the composition of the other crystal is nearer to ideal, and similar to synthetic grimselite. The presence of Na atoms in KO8 polyhedra, which are located in channels in the crystal structure, reduces their volume, and as a result the unit-cell volume also decreases. Structure refinement shows that the formula for the sample with the anomalously high Na content is (K2.43Na0.57)Σ3.00Na[(UO2)(CO3)3](H2O). The unit-cell parameters, refined in space group P2c, are a = 9.2507(1), c = 8.1788(1) Å, V = 606.14(3) Å3 and Z = 2. The crystal structure was refined to R1 = 0.0082 and wR1 = 0.0185 with a GOF = 1.33, based on 626 observed diffraction peaks [Iobs>3σ(I)].

Keywords

uranyl carbonategrimselitecrystal structurechemical compositionJáchymov
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 3 , June 2012 , pp. 443 - 453
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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