Articles | Volume 32, issue 6
https://doi.org/10.5194/ejm-32-623-2020
https://doi.org/10.5194/ejm-32-623-2020
Research article
 | 
14 Nov 2020
Research article |  | 14 Nov 2020

Contribution to the crystal chemistry of lead-antimony sulfosalts: systematic Pb-versus-Sb crossed substitution in the plagionite homologous series, Pb2N − 1(Pb1 − xSbx)2(Sb1 − xPbx)2Sb6S13+2N

Yves Moëlo and Cristian Biagioni

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Cited articles

Basu, K., Bortnikov, N. S., Mookherje, A., Mozgova, N. N., Tsepin, A. I., and Vyalsov, L. N.: Rare minerals from Rajpura-Dariba, Rajasthan, India, IV: a new Pb-Ag-Tl-Sb sulphosalt, rayite, Neues Jb. Miner. Monat., 1983, 296–304, 1983. 
Bente, K. and Meier-Salimi, M.: Substitution experiments and structure investigations on Ag-Tl bearing boulangerites – a contribution to the rayite problem, Neues Jb. Miner. Abh., 163, 212–216, 1991. 
Biagioni, C., Bindi, L., Momma, K., Miyawaki, R., Matsushita, Y., and Moëlo, Y.: Determination of the crystal structure and redefinition of tsugaruite, Pb28As15S50Cl, the first lead-arsenic chloro-sulfosalt, Can. Mineral., in press, 2020. 
Brese, N. E. and O'Keeffe, M.: Bond-valence parameters for solids, Acta Crystallogr., B47, 192–197, 1991. 
Bril, H.: Fluid inclusion study of Sn-W-Au, Sb- and Pb-Zn mineralizations from the Brioude-Massiac district (French Massif Central), Tscher. Miner. Petrog., 30, 1–16, 1982. 
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Short summary
The plagionite group is a family of complex sulfides (lead-antimony sulfosalts) encountered in various Pb-Cu-Zn ore deposits. Analysis of these crystal structures confirms a systematic Pb-versus-Sb substitution in two adjacent cation positions. Such a substitution varies according not only to the Pb / Sb ratio of each member but also, apparently, to the kinetics of crystallization. Re-examination of a Pb-free synthetic derivative permitted its redefinition as a Na-Sb sulfosalt.