Abstract
A series of amphiboles along the magnesioriebeckite—□Na2Mg3Fe3+ 2Si8O22(OH)2– ferri-clinoholmquistite—□Li2Mg3Fe3+ 2Si8O22(OH)2 - join, defined by the BLiB Na−1 exchange vector, were hydrothermally synthesized at 700°C, 0.4 GPa, NNO + 1 redox conditions. Powder XRD and SEM-EDAX showed a very high (> 90%) amphibole yield for all samples. X-ray patterns were indexed in the C2/m space group; refined cell-parameters show a linear decrease of a and β as a function of chemistry. IR spectra in the OH-stretching region show four main and rather sharp bands; these are assigned to Mg and Fe2+ at M(1,3), and indicate that the obtained amphiboles depart from the nominal octahedral composition (M1,3Mg3). The IR spectra also show that there is an increasing filling-up of the A-site for increasing Na in the system (increasing solid-solution toward, arfvedsonite). Mössbauer spectra show four well-defined quadrupole doublets which are assigned to Fe3+ at M2 and to Fe2+ at M1, M3 and M4, respectively. The Fe3+/Fe2+ content derived from fitted peak areas show variable Fe3+ concentration along the series. Mössbauer spectra also show a distinct alteration of 57Fe hyperfine parameters with changing Na–Li at M4. The most evident variation is observed for the quadrupole splitting of Fe3+ at M2, which increases by ≈50% from ferri-clinoholmquistite to magnesio-riebeckite; this suggest that the M2 octahedron in ferri-clinoholmquistite is much closer to the ideal geometry than the M2 octahedron in magnesio-riebeckite. Mössbauer spectra show also a well-defined increase in the Fe2+ quadrupole splitting of the M1 and M3 octahedra, which is attributed to the Na–Li distribution at the B-sites.
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Acknowledgements
The syntheses described here were done during the PhD work of GI at I.S.T.O.-CNRS, Orlèans (France), financially supported by a grant from the University of Chieti (Italy) and the Italian Ministry of Foreign Affairs. The post-doc stay of GI at Bayerisches GeoInstitut was financed by a Sofja Kovalevskaja Program. Sincere thanks are due to G. Amthauer (Salzburg) for allowing the use of Mössbauer equipments and to Mag. G. Tippelt for assistance during the Mössbauer data collection. Financial support to GJR was provided by the Austrian “Fonds zur Förderung der Wissenschaftlichen Forschung” grant R33-N10 (Schrödinger-Rückkehr-Programm). Critical review from two anonymous referees improved the clarity of the paper.
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Della Ventura, G., Redhammer, G.J., Iezzi, G. et al. A Mössbauer and FTIR study of synthetic amphiboles along the magnesioriebeckite – ferri-clinoholmquistite join. Phys Chem Minerals 32, 103–113 (2005). https://doi.org/10.1007/s00269-005-0451-1
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DOI: https://doi.org/10.1007/s00269-005-0451-1