1. Institute of Geochemistry, Mineralogy and Mineral Resources Faculty of Science Charles University Prague 2 Czech Republic
2. Institute of Petrology and Structural Geology Faculty of Science Charles University Prague 2 Czech Republic
3. Czech Geological Survey Prague 5 Czech Republic
4. Department of Soil Science and Soil Protection Faculty of Agrobiology Food and Natural Resources Czech University of Life Sciences Prague Prague 6 Czech Republic
5. Department of Geology Faculty of Science Palacký University in Olomouc Olomouc Czech Republic
6. Department of Geology Faculty of Science University of Botswana Gaborone Botswana