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A chemical and structural re-examination of fettelite samples from the type locality, Odenwald, southwest Germany

Published online by Cambridge University Press:  05 July 2018

L. Bindi ,
R. T. Downs ,
P. G. Spry ,
W. W. Pinch  and
S. Menchetti
L. Bindi*
Affiliation:
Dipartimento di Scienze della Terra, Universitá degli Studi di Firenze, Via G. La Pira 4, I-50121 Firenze, Italy CNR — Istituto di Geoscienze e Georisorse, Sezione di Firenze, Via G La Pira 4, I-50121 Firenze, Italy
R. T. Downs
Affiliation:
Department of Geosciences, University of Arizona, Tucson, Arizona 85721-0077, USA
P. G. Spry
Affiliation:
Department of Geological and Atmospheric Sciences, 253 Science I, Iowa State University, Ames, Iowa 50011-3212, USA
W. W. Pinch
Affiliation:
19 Stonebridge Lane, Pittsford, New York 14534, USA
S. Menchetti
Affiliation:
Dipartimento di Scienze della Terra, Universitá degli Studi di Firenze, Via G. La Pira 4, I-50121 Firenze, Italy
*
*E-mail: luca.bindi@unifi.it
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Abstract

The crystal structure and chemical composition of two samples of fettelite from the type locality, including a portion of the holotype material, was investigated to verify if a previously proposed revision of the chemical formula was applicable, and to study the role of cation substitution for Hg that would suggest new members of the fettelite family. The crystal structure of fettelite from the type locality was found to be equivalent to that reported previously for the Chilean occurrence, and consists of an alternation of two kinds of layers along c: layer A with general composition [Ag6As2S7]2– and layer B with general composition [Ag10HgAs2S8]2+. In this structure, the Ag atoms occur in various coordination configurations, varying from quasi-linear to quasi-tetrahedral, the AsS3 groups form pyramids as are typically observed in sulfosalts, and Hg links two sulfur atoms in a linear coordination. The refined compositions for the crystals in this study, [Ag6As2S7][Ag10(Fe0.53Hg0.47)As2S8] (R100124) and [Ag6As2S7][Ag10(Hg0.79Cu0.21)As2S8] (R110042), clearly indicate that new mineral species related to fettelite are likely to be found in nature.

Keywords

fetteliteHg-sulfosaltspearceitepolybasitecrystal structureGlasberg quarryOdenwaldGermany
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 3 , June 2012 , pp. 551 - 566
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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Structure Factors

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Structure factors

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