2011
Běhounekite, U(SO4)2(H2O)4, from Jáchymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate.
PLÁŠIL, Jakub, Karla FEJFAROVÁ, Milan NOVÁK, Michal DUŠEK, Radek ŠKODA et. al.Základní údaje
Originální název
Běhounekite, U(SO4)2(H2O)4, from Jáchymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate.
Autoři
PLÁŠIL, Jakub (203 Česká republika, garant, domácí), Karla FEJFAROVÁ (203 Česká republika), Milan NOVÁK (203 Česká republika, domácí), Michal DUŠEK (203 Česká republika), Radek ŠKODA (203 Česká republika, domácí), Jan HLOUŠEK (203 Česká republika), Jiří ČEJKA (203 Česká republika), Juraj MAJZLAN (276 Německo), Jiří SEJKORA (203 Česká republika), Vladimír MACHOVIČ (203 Česká republika) a Dominik TALLA (203 Česká republika, domácí)
Vydání
Mineralogical Magazine, 2011, 0026-461X
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10302 Condensed matter physics
Stát vydavatele
Velká Británie a Severní Irsko
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 1.321
Kód RIV
RIV/00216224:14310/11:00055960
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000298307000003
Klíčová slova anglicky
uranium minerals; X-ray diffraction; crystal structure; Jana2006
Změněno: 11. 5. 2012 10:27, doc. Mgr. Radek Škoda, Ph.D.
Anotace
V originále
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.
Návaznosti
MSM0021622412, záměr |
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