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First Italian occurrence of cumengéite from Vesuvius: crystal-structure refinement and revision of the chemical formula

Published online by Cambridge University Press:  05 July 2018

G. Cruciani ,
P. Orlandi ,
M. Pasero  and
M. Russo
G. Cruciani
Affiliation:
Dipartimento di Scienze della Terra, Università di Ferrara, Corso Ercole I d'Este 32, I-44100 Ferrara, Italy
P. Orlandi
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa and CNR-IGG, Via S. Maria 53, I-56126 Pisa, Italy
M. Pasero*
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa and CNR-IGG, Via S. Maria 53, I-56126 Pisa, Italy
M. Russo
Affiliation:
Osservatorio Vesuviano, INGV, Via Diocleziano, 328, I-80124 Napoli, Italy
*
*E-mail: [email protected]
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Abstract

The first Italian occurrence of cumengéite, a rare Pb and Cu hydroxychloride, is described from Vesuvius (Italy). Italian cumengéite has a volcanic origin (it occurs in the fumarole), which is unique for that mineral. The mineralogy of Vesuvius' fumarole is outlined briefly. A powder X-ray diffraction (XRD) pattern of cumengéite is presented. The crystal structure of cumengéite has been refined (R = 0.036) using single-crystal XRD data. Cumengéite is tetragonal, space group I4/mmm, a 15.1007(2), c 24.4940(4) Å. In the structure of cumengéite there are five independent Pb atoms, which are linked to 6—9 anions in five different ways. The structural study revealed the presence of two independent and previously unobserved water molecules, and led to the revision of the accepted chemical formula for the mineral: the new formula is Cu20Pb21Cl42(OH)40·6H2O. Analytical data taken from the literature for cumengéite from Boléo, Mexico (the type locality), as well as a new structural study carried out on the type material confirmed the new formula.

Keywords

cumengéiteVesuviusItalycrystal structurecrystal-chemical formula
Type
Research Article
Information
Mineralogical Magazine , Volume 69 , Issue 6 , December 2005 , pp. 1037 - 1045
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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