(uranová ložiska severočeské křídy)
Important uranium accumulations at the base of Cretaceous (Cenomanian) sediments. Several so-called deposits (Stráž, Hamr, Holičky, Osečná – Kotel, Břevniště, Hvězdov) were exploited by underground mining and acid leaching.
Characteristic for these deposits is a U-Zr-P-Ti (mostly microscopic) mineralization within a sandstone matrix. The mineralization is divided between a uranium and a uranium-zirconium subtype. Major minerals with economical importance are oxides of U4+ (uraninite s.l.), ningyoite and uranium-bearing "hydrozircon". Less abundant are "uranium-bearing leucoxens s.l.", coffinite and vyacheslavite.
References:
- Scharm, B.: Přehled minerálů nalezených v oblasti uranových koncentrací v severočeské křídě. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1995, roč. 3, s. 169-172.
- Scharm, B., Scharmová, M., Sulovský, P. and Kühn, P. (1991): Philipsbornite, arsenoflorencite-(La), and arsenoflorencite-(Nd) from the uranium district in northern Bohemia, Czechoslovakia. Casopis mineral. geol. 36, 103-113.
Mineral List:133 entries listed. 126 valid minerals.
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