Mitolo, D.; Pinto, D.; Garavelli, A.; Bindi, L.; Vurro, F. (May 2009). "The role of the minor substitutions in the crystal structure of natural challacolloite, KPb2Cl5, and hephaistosite, TlPb2Cl5, from Vulcano (Aeolian Archipelago, Italy)". Mineralogy and Petrology96 (1–2): 121–128. doi:10.1007/s00710-008-0041-2. Bibcode: 2009MinPe..96..121M.
Mitolo, D.; Pinto, D.; Garavelli, A.; Bindi, L.; Vurro, F. (May 2009). "The role of the minor substitutions in the crystal structure of natural challacolloite, KPb2Cl5, and hephaistosite, TlPb2Cl5, from Vulcano (Aeolian Archipelago, Italy)". Mineralogy and Petrology96 (1–2): 121–128. doi:10.1007/s00710-008-0041-2. Bibcode: 2009MinPe..96..121M.
Jochen Schlüter, Dieter Pohl and Sergey Britvin; The new mineral challacolloite, KPb2Cl5, the natural occurrence of a technically known laser material, N. Jb. Miner. Abh., 2005, Vol.182/1, p. 95–101 pdf