1. Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic, Bureau des Recherches Géologiques et Minières (BRGM), av. Claude Guillemin, 45060 Orléans, Cedex 2, France, Centre de Recherche en Matière Condensée et Nanosciences (CRMCN-CNRS), Campus de Luminy, 13288 Marseille, Cedex 09, France, Geotest Brno, Office of Prague, Máchova 23, 120 00 Praha 2, Czech Republic, Laboratory of Geological Departments, Charles University, Albertov 6, 128 43...