1989/04/01 by J. M. Charnock, John Charnock, C. David Garner +4
Earth and Planetary Sciences · Materials Science · #Crystal Structures and Properties #Mineralogy and Gemology Studies #X-ray Diffraction in Crystallography
paper · doi:10.1180/minmag.1989.053.370.06
crossref issued 1989/04/01 · crossref published 1989/04/01 · crossref published-print 1989/04/01 · openalex publication_date 1989/04/01 · crossref created 2006/12/07 · crossref published-online 2018/07/05 · crossref deposited 2021/08/05 · openalex created_date 2025/10/10 · crossref indexed 2026/07/29 · openalex updated_date 2026/08/01
Abstract EXAFS and Mössbauer data on synthetic silver-rich tetrahedrite, (Cu, Ag) 10+x Fe 2−x Sb 4 S 13 , reveal the presence of Fe 2+ and Fe 3+ the former occupying trigonal planar sites and the latter tetrahedral sites. There is also a clear relationship between increased silver substitution and an increase in Fe 2+ . The amount of Fe 3+ incorporated in the synthetic tetrahedrites is proportional to the excess of Cu + (Cu + Ag > 10 atoms) in the mineral, thus maintaining a charge balance. The iron in the natural tetrahedrites and the tennantite examined is mainly tetrahedrally co-ordinated Fe 2+ .