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The crystal chemistry of the uranyl carbonate mineral grimselite, (K,Na)(3)Na[(UO2)(CO3)(3)](H2O), from Jachymov, Czech Republic

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PLÁŠIL Jakub FEJFAROVÁ Karla SKALA Roman ŠKODA Radek MEISSER Nicolas HLOUŠEK Jan CÍSAŘOVÁ Ivana DUŠEK Michal VESELOVSKÝ František ČEJKA Jiří SEJKORA Jiří ONDRUŠ Petr

Rok publikování 2012
Druh Článek v odborném periodiku
Časopis / Zdroj Mineralogical Magazine
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.1180/minmag.2012.076.3.01
Obor Fyzika pevných látek a magnetismus
Klíčová slova uranyl carbonate; grimselite; crystal structure; chemical composition; Jachymov
Popis Two crystals of the uranyl carbonate mineral grimselite, ideally K3Na[(UO2)(CO3)3](H2O), from Jáchymov in the Czech Republic were studied by single-crystal X-ray diffraction and electron-probe microanalysis. One crystal has considerably more Na than the ideal chemical composition due to substitution of Na into KO8 polyhedra; the composition of the other crystal is nearer to ideal, and similar to synthetic grimselite. The presence of Na atoms in KO8 polyhedra, which are located in channels in the crystal structure, reduces their volume, and as a result the unit-cell volume also decreases. Structure refinement shows that the formula for the sample with the anomalously high Na content is (K2.43Na0.57)3.00Na[(UO2)(CO3)3](H2O). The unit-cell parameters, refined in space group P62c, are a = 9.2507(1), c = 8.1788(1) Angstr., V = 606.14(3) A^3 and Z = 2. The crystal structure was refined toR1 = 0.0082 and wR1 = 0.0185 with a GOF = 1.33, based on 626 observed diffraction peaks [Iobs>3sigma(I)].
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