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@article{974485,
author = {Plášil, Jakub and Fejfarová, Karla and Novák, Milan and Dušek, Michal and Škoda, Radek and Hloušek, Jan and Čejka, Jiří and Majzlan, Juraj and Sejkora, Jiří and Machovič, Vladimír and Talla, Dominik},
article_number = {6},
doi = {http://dx.doi.org/10.1180/minmag.2011.075.6.2739},
keywords = {uranium minerals; X-ray diffraction; crystal structure; Jana2006},
language = {eng},
issn = {0026-461X},
journal = {Mineralogical Magazine},
title = {Běhounekite, U(SO4)2(H2O)4, from Jáchymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate.},
volume = {75},
year = {2011}
}
TY - JOUR
ID - 974485
AU - Plášil, Jakub - Fejfarová, Karla - Novák, Milan - Dušek, Michal - Škoda, Radek - Hloušek, Jan - Čejka, Jiří - Majzlan, Juraj - Sejkora, Jiří - Machovič, Vladimír - Talla, Dominik
PY - 2011
TI - Běhounekite, U(SO4)2(H2O)4, from Jáchymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate.
JF - Mineralogical Magazine
VL - 75
IS - 6
SP - 2739-2753
EP - 2739-2753
SN - 0026461X
KW - uranium minerals
KW - X-ray diffraction
KW - crystal structure
KW - Jana2006
N2 - 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.
ER -
PLÁŠIL, Jakub, Karla FEJFAROVÁ, Milan NOVÁK, Michal DUŠEK, Radek ŠKODA, Jan HLOUŠEK, Jiří ČEJKA, Juraj MAJZLAN, Jiří SEJKORA, Vladimír MACHOVIČ and Dominik TALLA. Běhounekite, U(SO4)2(H2O)4, from Jáchymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate. \textit{Mineralogical Magazine}. 2011, vol.~75, No~6, p.~2739-2753. ISSN~0026-461X. Available from: https://dx.doi.org/10.1180/minmag.2011.075.6.2739.
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