1. Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University in Prague, Prague, Czech Republic.
2. Centre for Astrobiology and Extremophiles Research, School of Life Sciences, University of Bradford, Bradford, UK.
3. Department of Physics and Astronomy, Space Sciences Research Centre, University of Leicester, Leicester, UK.
4. Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain.