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American Mineralogist; August-September; v. 94; no. 8-9; p. 1262-1270; DOI: 10.2138/am.2009.3163
© 2009 Mineralogical Society of America
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Crystal structure and iron topochemistry of erionite-K from Rome, Oregon, U.S.A.

Paolo Ballirano1,2, Giovanni B. Andreozzi1,3, Meral Dogan4 and A. Umran Dogan5,6,*

1 Dipartimento di Scienze della Terra, Sapienza Università di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
2 CNR-IGAG, Istituto di Geologia Ambientale e Geoingegneria, Sede di Roma, Via Bolognola 7, I-00138 Rome, Italy
3 CNR-IGG, Istituto di Geoscienze e Georisorse, Sede di Roma, P.le A. Moro, 5, I-00185 Rome, Italy
4 Department of Geological Engineering, Hacettepe University, Ankara, Turkey
5 Department of Geological Engineering, Ankara University, Ankara, Turkey
6 Department of Chemical and Biochemical Engineering, The University of Iowa, Iowa City, Iowa 52242, U.S.A.

Correspondence: * E-mail: umran-dogan{at}uiowa.edu

A complete crystal-chemical characterization of erionite-K from Rome, Oregon, was obtained by combining field emission scanning electron microscopy, laboratory parallel-beam transmission powder diffraction, and 57Fe Mössbauer spectroscopy. Rietveld refinement results evidenced that the most striking difference in comparison with the structure of erionite-Ca is significant K at a K2 site(1/2, 0, 0), which is empty in erionite-Ca. In addition, site Ca1 shows low occupancy and Ca3 is vacant. The oxidation and coordination state of Fe, whose occurrence was revealed by chemical analysis, have been clarified by exploiting room- and low-temperature 57Fe Mössbauer spectroscopy. The majority of Fe (95%) was attributed to Fe3+-bearing, superparamagnetic, oxide-like nanoparticles with dimensions between 1 and 9 nm, and the remaining 5% was attributed to hematite particles with size ≥10 nm, both located on the crystal surface.

Key Words: Oregon erionite • erionite-K • crystal structure • iron topochemistry • field emission • scanning electron microscopy • laboratory parallel-beam transmission powder diffraction • Rietveld refinement • 57Fe Mössbauer spectroscopy






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