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

L. Bindi, R. T. Downs, P. G. Spry, W. W. Pinch and S. Menchetti
A chemical and structural re-examination of fettelite samples from the type locality, Odenwald, southwest Germany
Mineralogical Magazine (June 2012) 76 (3): 551-566

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 [Ag (sub 6) As (sub 2) S (sub 7) ] (super 2-) and layer B with general composition [Ag (sub 10) HgAs (sub 2) S (sub 8) ] (super 2+) . In this structure, the Ag atoms occur in various coordination configurations, varying from quasi-linear to quasi-tetrahedral, the AsS (sub 3) 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, [Ag (sub 6) As (sub 2) S (sub 7) ][Ag (sub 10) (Fe (sub 0.53) Hg (sub 0.47) )As (sub 2) S (sub 8) ] (R100124) and [Ag (sub 6) As (sub 2) S (sub 7) ][Ag (sub 10) (Hg (sub 0.79) Cu (sub 0.21) )As (sub 2) S (sub 8) ] (R110042), clearly indicate that new mineral species related to fettelite are likely to be found in nature.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 76
Serial Issue: 3
Title: A chemical and structural re-examination of fettelite samples from the type locality, Odenwald, southwest Germany
Affiliation: Universita degli Studi di Firenze, Dipartimento di Scienze della Terra, Florence, Italy
Pages: 551-566
Published: 201206
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 17
Accession Number: 2012-092167
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N49°10'00" - N49°51'00", E08°46'60" - E09°45'00"
Secondary Affiliation: University of Arizona, USA, United StatesIowa State University, USA, United States
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201248
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