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Běhounekite, U(SO4)2(H2O)4, from Jáchymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate.

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PLÁŠIL Jakub FEJFAROVÁ Karla NOVÁK Milan DUŠEK Michal ŠKODA Radek HLOUŠEK Jan ČEJKA Jiří MAJZLAN Juraj SEJKORA Jiří MACHOVIČ Vladimír TALLA Dominik

Rok publikování 2011
Druh Článek v odborném periodiku
Časopis / Zdroj Mineralogical Magazine
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.1180/minmag.2011.075.6.2739
Obor Fyzika pevných látek a magnetismus
Klíčová slova uranium minerals; X-ray diffraction; crystal structure; Jana2006
Popis 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 (U0.99Y0.03)1.02(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. 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 (U0.99Y0.03)1.02(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.
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