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Thermophilic (45-75°C) iron-reducing bacteria obtained from two sedimentary basins in Virginia and Colorado, USA, reduced amorphous Fe(III) oxyhydroxide to form magnetite-rich (>60% in most samples) iron oxides in acetate- or H 2 /CO 2 -enriched cultures. The mineralogical compositions of the iron oxides were determined by X-ray diffraction and oxidation state analyses. Significantly...