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The crystal-chemistry of riebeckite, ideally Na2Fe32+ Fe23+Si8O22(OH)2: a multi-technique study

Published online by Cambridge University Press:  28 February 2018

Umberto Susta ,
Giancarlo Della Ventura ,
Frank C. Hawthorne ,
Yassir A. Abdu ,
Maxwell C. Day ,
Boriana Mihailova  and
Roberta Oberti
Umberto Susta
Affiliation:
Dipartimento di Scienze, Università di Roma Tre, I-00146 Roma, Italy
Giancarlo Della Ventura*
Affiliation:
Dipartimento di Scienze, Università di Roma Tre, I-00146 Roma, Italy INFN-LNF, I-00044 Frascati, Italy
Frank C. Hawthorne
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
Yassir A. Abdu
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
Maxwell C. Day
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
Boriana Mihailova
Affiliation:
Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
Roberta Oberti
Affiliation:
CNR-Istituto di Geoscienze e Georisorse, Sede di Pavia, I-27100 Pavia, Italy
*
*E-mail: giancarlo.dellaventura@uniroma3.it
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Abstract

In this work we report on a complete crystal-chemical characterization of a near end-member riebeckite from Malawi, and use the available data to critically compare information obtained from different analytical methods. The sample occurs as well-formed and very large single crystals in pegmatitic rocks. Accurate site-populations were determined by combining single-crystal structure refinement and electron microprobe analysis (EMPA). The Fe3+/Fe2+ ratio was obtained from Mössbauer spectroscopy. Lithium was quantified by Laser Ablation Inductively Coupled Plasma Mass Spectroscopy (LA-ICP-MS).

Fourier-Transform Infrared (FTIR) spectra, collected both on powders and single crystals, are presented and discussed. FTIR spectra in the NIR region are also presented for the first time for this amphibole. The FTIR data are compatible with complete local ordering of A cations close to F, and complete Fe2+/Mg disorder at M(1,3). Polarized Raman-scattering data collected from single crystals confirm this conclusion. In addition, it was found that FTIR data collected on powders provide the best agreement with the site occupancies derived from chemical (EMPA and LA-ICP-MS) and crystal-chemical data, possibly because they do not depend on experimental issues such as orientation and polarization.

Keywords

riebeckiteMalawiEMPMössbauercrystal-structureFTIR and Raman spectroscopy
Type
Article
Information
Mineralogical Magazine , Volume 82 , Issue 4 , August 2018 , pp. 837 - 852
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Sergey Krivovichev

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