Acknowledgements

This work was carried out, thanks to the support of the long-term conceptual development research organisation RVO: 67985891. The author is grateful to R. Škoda, Š. Benedová and P. Gadas from the Institute of Geological Sciences of the Masaryk University (Brno) for technical assistance with microprobe analysis of selected rock-forming and uranium minerals.

#### Author details

Miloš René

Address all correspondence to: rene@irsm.cas.cz

Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
