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Běhounekite, U(SO.sub.4./sub.).sub.2./sub.(H.sub.2./sub.O).sub.4./sub., from Jachymov (St Joachimsthal), Czech Republic: the first natural U.sup.4+./sup. sulphate
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SYSNO ASEP 0369630 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Běhounekite, U(SO4)2(H2O)4, from Jachymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate Author(s) Plášil, J. (CZ)
Fejfarová, Karla (FZU-D)
Novák, M. (CZ)
Dušek, Michal (FZU-D) RID, ORCID, SAI
Škoda, R. (CZ)
Hloušek, J. (CZ)
Čejka, J. (CZ)
Majzlan, J. (DE)
Sejkora, J. (CZ)
Machovič, Vladimír (USMH-B)
Talla, D. (CZ)Source Title Mineralogical Magazine - ISSN 0026-461X
Roč. 75, č. 6 (2011), s. 2739-2753Number of pages 15 s. Language eng - English Country GB - United Kingdom Keywords uranium minerals ; X-ray diffraction ; crystal structure ; Jana2006 Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GAP204/11/0809 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100521 - FZU-D (2005-2011) AV0Z30460519 - USMH-B (2005-2011) UT WOS 000298307000003 DOI 10.1180/minmag.2011.075.6.2739 Annotation Behounekite, orthorhombic U(SO4)2(H2O)4, is the first natural sulphate of U4+. It was found in the Geschieber vein, Jachymov (St Joachimsthal) ore district, Western Bohemia, Czech Republic, crystallized on the altered surface of arsenic. The crystals have a strong vitreous lustre and a grey to greenish grey streak. They are brittle with an uneven fracture and have very good cleavage along {100}. The Mohs hardness is about 2. The empirical formula of behounekite is (U0.99Y0.33)Σ1.02(SO4)1.97(H2O)4. The simplified formula is U(SO4)2(H2O)4. Behounekite is orthorhombic, space group Pnma; the crystal structure consists of layers built up from [8]-coordinate uranium atoms and sulphate tetrahedra. The eight ligands include four oxygen atoms from the sulphate groups and four oxygen atoms from the H2O molecules. Each uranium coordination polyhedron is connected via sulphate tetrahedra with other uranium polyhedra and through hydrogen bonds to the apices of sulphate tetrahedra. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
Number of the records: 1