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Fig. 6 | Geochemical Transactions

Fig. 6

From: Fe(II) reduction of pyrolusite (β-MnO2) and secondary mineral evolution

Fig. 6

57Fe Mössbauer spectra of pyrolusite resuspended 1, 2, and 3 times in 3 mM aqueous Fe(II), where the Fe isotope order of addition was 57Fe–56Fe–56Fe. A marked increase in magnetite character can be observed in successive spectra, which is indicative of chemical transformations occurring only in the initial 57Fe atoms oxidized and precipitated on the pyrolusite surface. A summary of lepidocrocite and magnetite ratios obtained from fitting of the Mössbauer spectra is available in Table 2

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