caa a22 4500 445389850 CHVBK 20180317143043.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00710-011-0174-6 doi (NATIONALLICENCE)springer-10.1007/s00710-011-0174-6 Agricolaite, a new mineral of uranium from Jáchymov, Czech Republic [Elektronische Daten] [Roman Skála, Petr Ondruš, František Veselovský, Ivana Císařová, Jan Hloušek] The new mineral agricolaite, a potassium uranyl carbonate with ideal formula K4(UO2)(CO3)3, occurs in vugs of ankerite gangue in gneisses in the abandoned Giftkiesstollen adit at Jáchymov, Czech Republic. The name is after Georgius Agricola (1494-1555), German scholar and scientist. Agricolaite occurs as isolated equant irregular translucent grains to 0.3mm with yellow color, pale yellow streak, and vitreous luster. It 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”. Experimental density is higher than 3.3g.cm−3, Dcalc is 3.531g. cm−3. 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 strongest lines in the powder X-ray diffraction pattern are d(I)(hkl): 6.061(55)(002), 5.087(57)(200), 3.740(100)(202), 3.393(43)(113), 2.281(52)(402). Average composition based on ten electron microprobe analyses corresponds to (in wt.%) UO3 48.53, K2O 31.49, CO2(calc) 22.04 which gives the empirical formula K3.98(UO2)1.01(CO3)3.00. The crystal structure was solved from single-crystal X-ray diffraction data and refined to R 1 = 0.0184 on the basis of the 1,308 unique reflections with F o > 4σF o. The structure of agricolaite is identical to that of synthetic K4(UO2)(CO3)3 and consists of separate UO2(CO3)3 groups organized into layers parallel to (100) and two crystallographically non-equivalent sites occupied by K+ cations. Both the mineral and its name were approved by the IMA-CNMNC. Springer-Verlag, 2011 Skála Roman Institute of Geology ASCR, v.v.i., Rozvojová 269, CZ-16500, Praha 6, Czech Republic aut Ondruš Petr Biskupský dvůr 2, CZ-11000, Praha 1, Czech Republic aut Veselovský František Czech Geological Survey, Klárov 3, CZ-11821, Praha 1, Czech Republic aut Císařová Ivana Department of Inorganic Chemistry, Charles University, Hlavova 2030, CZ-12843, Praha 2, Czech Republic aut Hloušek Jan Komenského 821, CZ-36251, Jáchymov, Czech Republic aut Mineralogy and Petrology Springer Vienna 103/1-4(2011-11-01), 169-175 0930-0708 103:1-4<169 2011 103 710 https://doi.org/10.1007/s00710-011-0174-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-011-0174-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Skála Roman Institute of Geology ASCR, v.v.i., Rozvojová 269, CZ-16500, Praha 6, Czech Republic aut NATIONALLICENCE 700 1- Ondruš Petr Biskupský dvůr 2, CZ-11000, Praha 1, Czech Republic aut NATIONALLICENCE 700 1- Veselovský František Czech Geological Survey, Klárov 3, CZ-11821, Praha 1, Czech Republic aut NATIONALLICENCE 700 1- Císařová Ivana Department of Inorganic Chemistry, Charles University, Hlavova 2030, CZ-12843, Praha 2, Czech Republic aut NATIONALLICENCE 700 1- Hloušek Jan Komenského 821, CZ-36251, Jáchymov, Czech Republic aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer Vienna 103/1-4(2011-11-01), 169-175 0930-0708 103:1-4<169 2011 103 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer