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Fig. 4 | Geochemical Transactions

Fig. 4

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

Fig. 4

Scanning electron micrographs reveal significant changes in particle morphology that occur when unreacted pyrolusite particles (a) are exposed to aqueous Fe(II). After one reaction sequence of pyrolusite with 3 mM aqueous Fe(II) extensive rod-like surface precipitates (b) cover the surface of every particle that was imaged. Images of particles resuspended two (c) and three (d) times in 3 mM aqueous Fe(II) show a morphological transition from rod-like precipitates to spherical particles. Scale bars in all images are 2 µm

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