Record details

    Crystal chemistry of the natural uranyl carbonate mineral grimselite, (K, Na)3Na[(UO2)(CO3)3](H2O), from Jáchymov, Czech Republic
    Císařová, Ivana
    Čejka, Jiří
    Dušek, Michal
    Fejfarová, Karla
    Hloušek, Jan
    Meisser, Nicolas
    Ondruš, Petr
    Plášil, Jakub
    Sejkora, Jiří
    Skála, Roman
    Škoda, Radek
    Veselovský, František
Publication type
    článek v periodiku
Source title - serial
    Mineralogical Magazine
    Roč. 76, č. 3
Thesaurus term
    uranyl carbonate, grimselite, crystal structure, chemical composition, Jáchymov, Czech Republic
Abstract (in english)
   Crystals of uranyl carbonate mineral grimselite, ideally K3Na[(UO2)(CO3)3](H2O), from Jáchymov, Czech Republic were studied by single-crystal X-ray diffraction and electron probe microanalysis.The unit cell parameters for grimselite are (for hexagonal space group P-62/c) a = 9.2507(1), c = 8.1788(1) A with unit cell volume V = 606.14(3) A3, Z = 2. Crystal structure was refined from the high-quality collected data to final R1 = 0.0082, wR1 = 0.0185 with GOF = 1.33 based on 626 observed diffractions [Iobs>3?(I)]. Entering of Na atom into KO8 polyhedra, which are located in the channel-voids within grimselite crystal structure, results in decrease of polyhedral and consequently unit-cell volume due to smaller ionic radius of sodium compared to potassium. According to structure refinement, chemical composition of (K, Na) grimselite from Jáchymov is (K2.43Na0.57)?3.00Na[(UO2)(CO3)3](H2O), Z = 2.
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
Import date
    15. 10. 2014