American Mineralogist, Volume 88, pages 686–693, 2003 Cejkaite, the triclinic polymorph of Na (UO )(CO ) —a new mineral from Jáchymov, 4 2 3 3 Czech Republic 1, 1 1 2 3 ˇ ˇ ´ ˇ PETR ONDRUS, * ROMAN SKÁLA, FRANTISEK VESELOVSKY, JIRÍ SEJKORA, AND CECILIA VITTI Czech Geological Survey, Klárov 3/131, P.O. Box 85, CZ-118 21 Prague 1, Czech Republic National Museum, Václavské náme ˇsti 68, CZ-115 79 Prague 1, Czech Republic Dipartimento di Scienze della Terra, Via Laterina, 8, I-53100 Siena, Italy ABSTRACT Cejkaite, a new mineral from Jáchymov, NW Bohemia, Czech Republic, forms a thin earthy efflorescence over a calcite vein associated with disintegrated uraninite. The color is pale yellow to beige, the streak is light yellow, and the luster is vitreous. The broad secondary mineral association includes andersonite and schröckingerite. Chemical analysis (by ICP-MS and TG) gave (in wt%): Na O = 21.39, MgO = 0.15, FeO = 0.53, UO = 53.93, and CO = 24.00 (calculated by difference). 2 3 2 The simplified chemical formula is Na UO (CO ) . The mineral is triclinic, space group P1 or P1, 4 2 3 3 a = 9.291(2), b = 9.292(2), c = 12.895(2)
American Mineralogist – de Gruyter
Published: Apr 1, 2003
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