Natural iowaite, magnesium–ferric oxychloride mineral having light green color originating from Australia has been characterized by EPR, optical, IR, and Raman spectroscopy. The optical spectrum exhibits a number of electronic bands due to both Fe(III) and Mn(II) ions in iowaite. From EPR studies, the g values are calculated for Fe(III) and g and A values for Mn(II). EPR and optical absorption studies confirm that Fe(III) and Mn(II) are in distorted octahedral geometry. The bands that appear both in NIR and Raman spectra are due to the overtones and combinations of water and carbonate molecules. Thus EPR, optical, and Raman spectroscopy have proven most useful for the study of the chemistry of natural iowaite and chemical changes in the mineral.
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Authors wish to express their sincere thanks to Prof. P.S. Rao, Dept of Chemistry, Pondicherry University, Pondicherry, India for providing EPR instrumental facility. One of us (SLR) is thankful to UGC, New Delhi for financial assistance (Major research no: 38-188/2009).
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Lakshmi Reddy, S., Sesha Maheswaramma, K., Siva Reddy, G. et al. Optical absorption, infrared, Raman, and EPR spectral studies on natural iowaite mineral. Transition Met Chem 35, 331–336 (2010). https://doi.org/10.1007/s11243-010-9331-8
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