1. Department of Biological, Geological and Environmental Sciences; University of Catania; C.so Italia, 57 95129 Catania Italy
2. Department of Physics and Earth Sciences; University of Parma; Parco Area delle Scienze, 7/A 43124 Parma Italy
3. Institute of Geochemistry, Mineralogy and Mineral Resources; Charles University in Prague, Faculty of Science; Albertov 6 12843 Prague, Czech Republic
4. Department of Archaeology; Ghent University; Sint-Pietersnieuwstraat 35 9000 Gent Belgium
5. Viale della Libertà; Messina Regional Museum, 465 98121 Messina Italy