1. Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic
2. Centre for Astrobiology and Extremophiles Research, School of Life Sciences, University of Bradford, Bradford BD7 1DP UK
3. Department of Physics and Astronomy, Space Sciences Research Centre, University of Leicester, Leicester LE1 7RH UK