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FTIR transmission spectroscopy of sideronatrite, a sodium-iron hydrous sulfate

Published online by Cambridge University Press:  05 July 2018

G. Della Ventura ,
G. Ventruti ,
F. Bellatreccia ,
F. Scordari  and
M. Cestelli Guidi
G. Della Ventura*
Affiliation:
Dipartimento di Scienze, Università di Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Rome, Italy INFN Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati, Rome, Italy
G. Ventruti
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università di Bari, via Orabona, 4, I-70125 Bari, Italy
F. Bellatreccia
Affiliation:
Dipartimento di Scienze, Università di Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Rome, Italy INFN Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati, Rome, Italy
F. Scordari
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università di Bari, via Orabona, 4, I-70125 Bari, Italy
M. Cestelli Guidi
Affiliation:
INFN Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati, Rome, Italy
*
* E-mail: dellaven@uniroma3.it
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Abstract

This paper relates an infrared (IR) (6000–2500; 1400–400 cm–1) spectroscopic study of sideronatrite, Na2Fe3+(SO4)2(OH)·3H2O. Spectra in the 600–1250 cm–1 range are dominated by fundamental S–O absorption bands. Factor-group analysis based on the space group P212121(D42) is in accordance with the observed band multiplicity. A broad and convolute absorption centred around 3400 cm–1 and a sharp band at 3605 cm–1 are observed in the 2900–3900 cm–1 frequency region. The resolution of the broad band is significantly improved at liquid nitrogen temperature; seven components can be fitted to the pattern and these can be assigned to H2O/OH molecules in the structure. All components in the broad band and the sharp absorption at 3605 cm–1 are strongly polarized for E//a, in accordance with the structure analysis results. Infrared transmission spectroscopy is a useful tool to identify these sulfate minerals occurring in specific geological environments.

Keywords

sideronatriteFTIR spectroscopypolarized measurements
Type
Research Article
Information
Mineralogical Magazine , Volume 77 , Issue 4 , June 2013 , pp. 499 - 507
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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