Citation: Mitolo, D.; Pinto, D.; Garavelli, A.; Bindi, L.; Vurro, F. (2009). The role of the minor substitutions in the crystal structure of natural challacolloite, KPb2Cl5, and hephaistosite, TiPb2Cl5, from Vulcano (Aeolian Archipelago, Italy). Mineralogy and Petrology, 96, pp. 121-128.