Abstract
Crystals of challacolloite, KPb2Cl5, and hephaistosite, TlPb2Cl5, from volcanic sublimates formed on the crater rim of the “La Fossa Crater” at Vulcano, Aeolian Archipelago, Italy, were investigated. Chemical compositions were \({\left( {{\text{K}}_{{0.93}} {\text{Tl}}_{{0.02}} } \right)}_{{\Sigma = 0.95}} {\text{Pb}}_{{2.04}} {\left( {{\text{Cl}}_{{4.90}} {\text{Br}}_{{0.11}} } \right)}_{{\Sigma = 5.01}} \) and \({\text{Tl}}_{{0.94}} {\text{Pb}}_{{2.01}} {\left( {{\text{Cl}}_{{4.91}} {\text{Br}}_{{0.14}} } \right)}_{{\Sigma = 5.05}} \), respectively. Single crystal X-ray measurements showed monoclinic symmetry for both phases, space group P21/c, with the following unit-cell parameters: a = 8.8989(4), b = 7.9717(5), c = 12.5624(8) Å, β = 90.022(4)°, V = 891.2(1) Å3, Z = 4 (challacolloite) and a = 9.0026(6), b = 7.9723(6), c = 12.5693(9) Å, β = 90.046(4)°, V = 902.1(1) Å3, Z = 4 (hephaistosite). The structure refinements converge to R = 3.99% and R = 3.86%, respectively. The effects of Br↔Cl and K↔Tl substitutions on the structure of these natural compounds have been discussed.
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Acknowledgements
The authors are grateful to I. Campostrini for his collaboration during the chemical analyses at the Dipartimento di Chimica Strutturale e Stereochimica Inorganica, Università degli Studi di Milano, Italy and E. Mesto for his assistance in the X-ray single-crystal measurements at the Dipartimento Geomineralogico, Universitá degli Studi di Bari, Italy. The authors are also indebted to the Associate Editor A. Beran and two anonymous referees whose suggestions contributed to improve the work. This research was performed with the financial support from Università degli Studi di Bari, Progetto di Ateneo 2006.
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Mitolo, D., Pinto, D., Garavelli, A. et al. The role of the minor substitutions in the crystal structure of natural challacolloite, KPb2Cl5, and hephaistosite, TlPb2Cl5, from Vulcano (Aeolian Archipelago, Italy). Miner Petrol 96, 121–128 (2009). https://doi.org/10.1007/s00710-008-0041-2
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DOI: https://doi.org/10.1007/s00710-008-0041-2