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Te-rich canfieldite, Ag (sub 8) Sn(S, Te) (sub 6) , from the Lengenbach Quarry, Binntal, Canton Valais, Switzerland; occurrence, description and crystal structure

Luca Bindi, Fabrizio Nestola, Alessandro Guastoni, Federico Zorzi, Luca Peruzzo and Thomas Raber
Te-rich canfieldite, Ag (sub 8) Sn(S, Te) (sub 6) , from the Lengenbach Quarry, Binntal, Canton Valais, Switzerland; occurrence, description and crystal structure
The Canadian Mineralogist (February 2012) 50 (1): 111-118

Abstract

In order to evaluate the effects of Te-for-S substitution in the minerals of the argyrodite group, the crystal structure and chemical composition of a crystal of Te-rich canfieldite from the Lengenbach quarry, Binntal, Switzerland, was investigated. The unit-cell parameters are a 11.0003(6) Aa and V 1331.1(1) Aa (super 3) . The structure was solved and refined in the space group F43 m to R (sub 1) =0.0308 for 194 independent reflections and 21 parameters. Quantitative analysis led to the chemical formula Ag (sub 8.05) (Sn (sub 1.03) Ge (sub 0.01) ) (sub Sigma 1.04) (S (sub 3.95) Te (sub 1.95) Se (sub 0.01) (sub Sigma 5.91) , ideally Ag (sub 8) Sn(S,Te) (sub 6) . The crystal structure of Te-rich canfieldite was found to be topologically identical to that of putzite, (Cu (sub 4.7) Ag (sub 3.3) )GeS (sub 6) . Neglecting the short Ag-Ag contacts (due to disorder), the two Ag atoms in the structure can be considered as three-fold (Ag1) and four-fold (Ag2) coordinated. Tin adopts a regular tetrahedral coordination. The refinement of the site-occupancy factor indicates Te to be disordered over the three anion positions (i.e., X1, X2, and X3), with a preference for the X1 site.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 50
Serial Issue: 1
Title: Te-rich canfieldite, Ag (sub 8) Sn(S, Te) (sub 6) , from the Lengenbach Quarry, Binntal, Canton Valais, Switzerland; occurrence, description and crystal structure
Affiliation: Universita di Firenze, Museo di Storia Naturale, Florence, Italy
Pages: 111-118
Published: 201202
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 34
Accession Number: 2012-065587
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N46°19'60" - N46°25'00", E08°05'60" - E08°13'60"
Secondary Affiliation: Universita di Padova, ITA, Italy
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201234
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