Original paper

Pb2Fe3+Cl3(OH)4-H20, a newly discovered natural phase from Tuscany, Italy: physico-chemical data, crystal structure, and OD character

Pasero, Marco; Perchiazzi, Natale; Bigi, Simona; Franzin, Marco; Merlino, Stefano

European Journal of Mineralogy Volume 9 Number 1 (1996), p. 43 - 52

24 references

published: Dec 30, 1997
manuscript accepted: Sep 16, 1996
manuscript received: Mar 23, 1996

DOI: 10.1127/ejm/9/1/0043

BibTeX file

ArtNo. ESP147050901005, Price: 29.00 €

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Abstract

Abstract A natural phase with chemical formula Pb2Fe Cl3+(OH)4-H2O, monoclinic, space group P21, a = 8.033(5), b = 6.253(3), c = 9.221(6) Å, ß = 102.98(8)°, was recently discovered within the Etruscan iron slags of Baratti. That phase, denoted as PFC, falls in the category of "geologically modified anthropogenic substances" and therefore cannot be regarded as a new mineral. Full chemical and physical data are given for PFC. Twinning on (001) is ubiquitous. The structure of PFC was solved and refined up to R = 0.082 for 1119 independent reflections collected with MoKα radiation on a twinned crystal. PFC displays a novel structural type, in which layers of face-sharing [PbX9] polyhedra alternate with layers containing columns of edge-sharing [Fe(OH)6] octahedra and structural voids. PFC belongs to a family of OD structures formed by equivalent layers. The OD character of PFC is fully described

Keywords

PFCcrystal structureOD-structureshydroxychloridesBaratti (Italy)