Agricolaite, a new mineral of uranium from Jáchymov, Czech Republic

0368288 - GLÚ 2012 RIV AT eng J - Journal Article
Skála, Roman - Ondruš, P. - Veselovský, F. - Císařová, I. - Hloušek, J.
Agricolaite, a new mineral of uranium from Jáchymov, Czech Republic.
Mineralogy and Petrology. Roč. 103, 1/4 (2011), s. 169-175. ISSN 0930-0708. E-ISSN 1438-1168
Institutional research plan: CEZ:AV0Z30130516
Keywords : agricolaite * uranyl carbonate * uranium * new mineral * Jáchymov
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 1.278, year: 2011

The new mineral agricolaite, a potassium uranyl carbonate, occurs in vugs of ankerite gangue in gneisses in the abandoned Giftkiesstollen adit at Jáchymov, Czech Republic. It occurs as isolated equant irregular translucent grains to 0.3 mm with yellow color, pale yellow streak, and vitreous luster, is brittle with uneven fracture and displays neither cleavage nor parting. Agricolaite is non-fluorescent. Mohs hardness is ~4. It is associated with aragonite, brochantite, posnjakite, malachite, rutherfordine, and “pseudo-voglite”. The mineral is monoclinic, space group C2/c, with a 10.2380(2), b 9.1930(2), c 12.2110(3) Å, β 95.108(2)°, V 1144.71(4) Å3, Z = 4. The structure of agricolaite is identical to that of synthetic K₄(UO₂)(CO₃)₃.
Permanent Link: http://hdl.handle.net/11104/0202676