1997
DOI: 10.1016/s0016-7037(97)00159-2
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Microbial transformation of magnetite to hematite

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Cited by 33 publications
(20 citation statements)
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“…Hematite is not viewed as a direct product of iron hydrolysis. Rather, it is usually formed through dehydration of hydrous oxides such as ferrihydrites or goethite (Brown et al, 1997;Chen et al, 2010;Cudennec and Lecerf, 2005;Cudennec and Lecerf 2006;Murray et al, 2009;Ruan et al, 2001). Ferrihydrite was not detected from the sample and as a matter of fact, the pH (below 3.5, refer to Table 2) at Site 10 did not favor the formation of ferrihydrite, as mentioned previously.…”
Section: Discussionsupporting
confidence: 60%
“…Hematite is not viewed as a direct product of iron hydrolysis. Rather, it is usually formed through dehydration of hydrous oxides such as ferrihydrites or goethite (Brown et al, 1997;Chen et al, 2010;Cudennec and Lecerf, 2005;Cudennec and Lecerf 2006;Murray et al, 2009;Ruan et al, 2001). Ferrihydrite was not detected from the sample and as a matter of fact, the pH (below 3.5, refer to Table 2) at Site 10 did not favor the formation of ferrihydrite, as mentioned previously.…”
Section: Discussionsupporting
confidence: 60%
“…Hematite (␣-Fe 2 O 3 ) is a stable low-temperature mineral that produces the red color in the clays used for both the Roman and Moknine pottery (Sherriff et al, this issue). Maghemite (␥-Fe 2 O 3 ) has a spinel structure similar to that of magnetite, but maghemite has Fe 3ϩ in both tetrahedral and octahedral sites whereas magnetite has both Fe 2ϩ and Fe 3ϩ in octahedral sites (Brown and Sherriff, 1997). Metastable maghemite is commonly produced during the hydrothermal oxidation of magnetite to hematite (Davis et al, 1968), but it is usually unstable below 750ЊC.…”
Section: Resultsmentioning
confidence: 99%
“…Bio¢lms from these consortia form rapidly on the granite, but a considerable time is necessary for the organisms to extract much iron from minerals in the granite [16]. We have therefore found it expedient, when growing bio¢lms for observation of iron precipitation, to supplement the media with iron chelated by ammonium citrate.…”
Section: Sample Source and Preparationmentioning
confidence: 99%
“…However, selective grazing of bio¢lms where attached bacteria are concentrated provide an important food source [14]. Active biomineralization by our consortium is demonstrated by the precipitation of iron in several forms, the reduction of ferric to ferrous iron, as well as the leaching of iron from iron minerals in the granite host rock and alteration of magnetite to hematite over a period of several weeks [12,15,16].…”
Section: Introductionmentioning
confidence: 97%