Crystallography and Surface Oxidation of Stoichiometric Arsenopyrite from Šumadija-Kopaonik Pb-Zn/Polymetallic Ore District (Serbia)

Author:

Jelić Ivana1,Pačevski Aleksandar1,Kremenović Aleksandar1ORCID,Šoster Aleš2,Šestan Andreja3ORCID,Zavašnik Janez4ORCID

Affiliation:

1. Faculty of Mining and Geology, University of Belgrade, Đušina 7, 11000 Belgrade, Serbia

2. Department of Geology, Faculty of Natural Sciences and Engineering, University of Ljubljana, Aškerčeva Cesta 12, 1000 Ljubljana, Slovenia

3. Centre for Electron Microscopy, Jožef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia

4. Gaseous Electronics Department, Jožef Stefan Institute, Jamova Cesta 39, 1000 Ljubljana, Slovenia

Abstract

The behaviour and stability of arsenopyrite largely depend on its crystal structure, but studies of crystallography and structural defects are scarce. For clarification, we investigated a series of natural arsenopyrite crystals from the polymetallic Pb-Zn-(±Cu,Ag,Au,Sb,Bi,W) Šumadija-Kopaonik ore district (Serbia) by powder X-ray diffraction (XRPD). Among them, samples from the Drenjak gold mineralisation showed near-stoichiometric FeAsS composition and were further investigated by conventional and high-resolution transmission electron microscopy methods. TEM revealed abundant planar crystallographic defects and epitaxial surface oxide layer formation upon air exposure. Our findings present the fundamental work on the prototype arsenopyrite structure and have further implications for studies on ion incorporation into FeAsS structure and its environmental stability and oxidation mechanisms as a source of anthropogenic As release into the environment.

Funder

Slovenian Research Agency

Publisher

MDPI AG

Subject

Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering

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