1. Department of Chemical & Geological Sciences University of Modena & Reggio Emilia Via Campi 103 41125 Modena Italy
2. Department of Earth & Planetary Sciences Yale University 210 Whitney Avenue New Haven CT 06511 USA
3. Department of Natural Sciences National Museum of Scotland Chambers Street Edinburgh EH1 1JF UK
4. Department of Earth & Environmental Sciences Pavia University via Ferrata 1 I‐27100 Pavia Italy
5. Department of Geosciences University of Padova Via Gradenigo 6 I‐35131 Padova Italy