Département de Géographie, Université Catholique de Louvain, 3, Place Louis Pasteur, Louvain-la-Neuve, 1348 Belgium ; Fonds National de la Recherche Scientifique (FNRS), Rue d'Egmont 5, Bruxelles, 1000 Belgium
Institute for Mineralogy, University of Hannover, Callinstrasse 3, Hannover, 30167 Germany
Department of Natural Resources, Faculty of Applied Sciences, Sabaragamuwa University, Buttala, 9999 Sri Lanka ;
Paul Scherrer Institute c/o Institute of Particle Physics, ETH Zurich, Zurich, 8093 Switzerland ;