Počet záznamů: 1
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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Běhounekite, U(SO4)2(H2O)4, from Jachymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate Tvůrce(i) 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)Zdroj.dok. Mineralogical Magazine - ISSN 0026-461X
Roč. 75, č. 6 (2011), s. 2739-2753Poč.str. 15 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova uranium minerals ; X-ray diffraction ; crystal structure ; Jana2006 Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GAP204/11/0809 GA ČR - Grantová agentura ČR CEZ AV0Z10100521 - FZU-D (2005-2011) AV0Z30460519 - USMH-B (2005-2011) UT WOS 000298307000003 DOI 10.1180/minmag.2011.075.6.2739 Anotace 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. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2012
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