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The crystal chemistry of the uranyl carbonate mineral grimselite, (K,Na) (sub 3) Na[(UO (sub 2) )(CO (sub 3) ) (sub 3) ](H (sub 2) O), from Jachymov, Czech Republic

J. Placil, K. Fejfarova, R. Skala, R. Skoda, N. Meisser, J. Hlousek, I. Cisarova, M. Dusek, F. Veselovsky, J. Cejka, J. Sejkora and P. Ondrus
The crystal chemistry of the uranyl carbonate mineral grimselite, (K,Na) (sub 3) Na[(UO (sub 2) )(CO (sub 3) ) (sub 3) ](H (sub 2) O), from Jachymov, Czech Republic
Mineralogical Magazine (June 2012) 76 (3): 443-453

Abstract

Two crystals of the uranyl carbonate mineral grimselite, ideally K (sub 3) Na[(UO (sub 2) )(CO (sub 3) ) (sub 3) ](H (sub 2) O), from Jachymov 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 KO (sub 8) polyhedra; the composition of the other crystal is nearer to ideal, and similar to synthetic grimselite. The presence of Na atoms in KO (sub 8) 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 (K (sub 2.43) Na (sub 0.57) ) (sub Sigma 3.00) Na[(UO (sub 2) )(CO (sub 3) ) (sub 3) ](H (sub 2) O). The unit-cell parameters, refined in space group P6i2c, are a = 9.2507(1), c = 8.1788(1) Aa, V = 606.14(3) Aa (super 3) and Z = 2. The crystal structure was refined to R (sub 1) = 0.0082 and wR (sub 1) = 0.0185 with a GOF = 1.33, based on 626 observed diffraction peaks [I (sub obs) >3sigma (I)].


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 76
Serial Issue: 3
Title: The crystal chemistry of the uranyl carbonate mineral grimselite, (K,Na) (sub 3) Na[(UO (sub 2) )(CO (sub 3) ) (sub 3) ](H (sub 2) O), from Jachymov, Czech Republic
Affiliation: Academy of Sciences of the Czech Republic, Institute of Physics, Prague, Czech Republic
Pages: 443-453
Published: 201206
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 22
Accession Number: 2012-092161
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 9 tables
N50°22'00" - N50°22'00", E12°55'00" - E12°55'00"
Secondary Affiliation: Academy of Sciences of the Czech Republic, Institute of Geology, CZE, Czech RepublicMasaryk University, CZE, Czech RepublicUniversite de Lausanne, CHE, SwitzerlandCharles University, CZE, Czech RepublicCzech Geological Survey, CZE, Czech RepublicNational Museum, CZE, Czech Republic
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201248
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