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Crystal structure and cation distribution in freibergite and tetrahedrite

Published online by Cambridge University Press:  05 July 2018

R. C. Peterson  and
I. Miller
R. C. Peterson
Affiliation:
Department of Geological Sciences, Queen's University, Kingston, Ontario, Canada K7L 3N6
I. Miller
Affiliation:
Department of Geological Sciences, Queen's University, Kingston, Ontario, Canada K7L 3N6
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Abstract

The crystal structure of a freibergite (Ag-tetrahedrite) from Keno Hill, Yukon, Canada, and a tetrahedrite from Turquetil Lake, NWT, Canada, have been refined. The freibergite, Cu5.84Ag4.22Fe1.59Zn0.43 Sb4.10AS0.13S13, a = 10.610(2) Å, and the tetrahedrite, Cu10.24Fe1.03Zn0.97Ag0.05Sb3.66As0.28S13, a = 10.364(2) Å, were both refined in space group I4̄3m. The refinements confirm that Ag does occupy the threefold coordinated metal site as first described by Kalbskopf (1972) and that Fe also occupies this site. The structural changes accompanying Ag substitution are described and a model to explain the upper limit of substitution at four atoms of silver for thirteen atoms of sulphur is proposed.

Type
Crystal structure studies
Information
Mineralogical Magazine , Volume 50 , Issue 358 , December 1986 , pp. 717 - 721
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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