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Structural role of tellurium in the minerals of the pearceite-polybasite group

Published online by Cambridge University Press:  05 July 2018

L. Bindi ,
P. Voudouris  and
P. G. Spry
L. Bindi*
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira, 4, I-50121, Florence, Italy
P. Voudouris
Affiliation:
Department of Mineralogy-Petrology, Faculty of Geology & Geoenvironment, National and Kapodistrian University of Athens, Panepistimiopolis, G-15784, Athens, Greece
P. G. Spry
Affiliation:
Department of Geological and Atmospheric Sciences, 253 Science I, Iowa State University, Ames, Iowa 50011-3212, USA
*
* E-mail: luca.bindi@unifi.it
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Abstract

The crystal structure of a Te-rich polybasite has been refined by means of X-ray diffraction data collected at room temperature (space group Pm1; R = 0.0505 for 964 observed reflections and 94 parameters; refined formula Ag14.46Cu1.54Sb1.58As0.42S9.67Te1.33). The structure comprises stacking of [(Ag, Cu)6(Sb, As)2(S, Te)7]2–A and [Ag9Cu(S, Te)2(S, Te)2]2+B layer modules in which Sb forms isolated SbS3 pyramids, as occurs typically in sulfosalts, Cu links two S atoms in a linear coordination and Ag occupies sites with coordination ranging from quasi linear to almost tetrahedral. The silver d10 ions are found in the B layer module along two-dimensional diffusion paths and their electron densities evidenced by means of a combination of a Gram-Charlier development of the atomic displacement factors and a split model. The Te-for-S substitution occurs at the same structural sites that Se substitutes for S in selenopolybasite and the Te occupancy at one of these sites is 0.49, thus suggesting the possibility that 'telluropolybasite' could be found in nature.

Keywords

polybasitetelluriumcrystal structureionic conductivitystructural disorderKallianou mineralizationGreece
Type
Research Article
Information
Mineralogical Magazine , Volume 77 , Issue 4 , June 2013 , pp. 419 - 428
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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