Tetrahedral ferric iron in phlogopite: XANES and Mossbauer compared to single-crystal X-ray data
Cruciani, Giuseppe; Zanazzi, Pier Francesco; Quartieri, Simona
European Journal of Mineralogy Volume 7 Number 2 (1995), p. 255 - 266
published: Mar 29, 1995
manuscript accepted: Oct 17, 1994
manuscript received: Dec 14, 1993
ArtNo. ESP147050702001, Price: 29.00 €
Abstract This paper reports the results of a combined methodological study performed on tetraferriphlogopite from the Araxà carbonatite. We compare Mossbauer spectroscopy and X-ray absorption near-edge spectroscopy (XANES) results to previously reported single-crystal X-ray and electron microprobe analysis data (Cruciani & Zanazzi, 1994). The combined techniques provide evidence for the presence of a remarkable amount of tetrahedrally coordinated Fe3+ in this sample, and show that high OH content in tetraferriphlogopite is compatible with the large Fe2O3/FeO ratio inferred from the chemical and spectroscopic data.