Characterization of the effects of silicon on the formation of goethite

Gómez, Jordi; Resende, Valdirene Gonzaga de; Antonissen, J.; Grave, E. De

doi:10.1016/j.corsci.2011.01.053

Cited by 16 publications

(2 citation statements)

References 17 publications

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“…The highly negative correlation between Al 2 O 3 and Fe 2 O 3 suggests Al substitution in goethite (Boulangé et al, 1996;Laskou et al, 2006). Although Si-associated goethite has been reported in diverse environments, little evidence supports that Si was incorporated into goethite lattice (Taitel-Goldman et al, 2004;Mejía-Gómez et al, 2011). The abundant Si presence in goethite may be a result of fine mineral inclusions and/or precipitation of SiO 2 on the goethite surface (Bischoff, 1969;Taitel-Goldman et al, 2004).…”

Section: Hematite and Goethitementioning

confidence: 98%

Mineralogical characteristics of the superlarge Quaternary bauxite deposits in Jingxi and Debao counties, western Guangxi, China

Liu

Wang

Zhang

et al. 2012

Journal of Asian Earth Sciences

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Section: Hematite and Goethitementioning

confidence: 98%

Mineralogical characteristics of the superlarge Quaternary bauxite deposits in Jingxi and Debao counties, western Guangxi, China

Liu

Wang

Zhang

et al. 2012

Journal of Asian Earth Sciences

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“…The effect of Si on goethite precipitation under acidic conditions has been previously reported only for goethite formed from ferrihydrite with adsorbed Si but not through Fe(III) hydrolysis. 88,91 The studies showed that the ratio of Si/Fe < 0.1 did not significantly retard the transformation at pH 1.6−1.8, resulting in almost complete ferrihydrite transformation, while the higher ratios led to only 50% ferrihydrite transformation during 60 days of aging. 88 Prior to hydrolysis reactions, the Si/Fe ratios were 0.01 and 0.08 in Santa Eulalia and Falconbridge solutions, respectively (calculated from the data shown in Figure 4a,b).…”

Section: ■ Resultsmentioning

confidence: 99%

Formation of Fe(III) (Hydr)oxides from Fe(II) Sulfides: Implications for Akaganeite Detection on Mars

Peretyazhko

Ming

Morris

et al. 2021

ACS Earth Space Chem.

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Akaganeite on Mars could form from Fe(II) sulfides, but formation conditions remain unconstrained. We investigated akageneite formation by oxidative alteration of natural pyrrhotites exposed to HCl and oxidation–hydrolysis of Fe(II) HCl-leached from pyrrhotites at initial pH0 1.5, 2, 3, and 4. X-ray diffraction and Mössbauer analyses revealed the formation of poorly crystallized akageneite in oxidative alteration experiments. Air exposure of the HCl-reacted dry pyrrhotites led to an increase in akageneite formation and precipitation of Fe(II) hydrated sulfates, goethite, and hydronium jarosite. Iron(II) oxidation–hydrolysis was sensitive to Si dissolved from phyllosilicates in one pyrrhotite sample. Akaganeite and goethite formed at pH0 1.5 and 2 with akageneite more abundant at a dissolved Si/Fe ratio of 0.08 and goethite more abundant at a Si/Fe of 0.01. Akaganeite formed together with hematite, ferrihydrite, and goethite at pH0 3, and formation was suppressed at pH0 4. Well-crystallized akageneite precipitated at pH0 1.5, while akaganeite of poorer crystallinity formed at pH0 2 and 3. Akageneite on Mars could form from sulfides by both mechanisms during late diagenetic events triggered by interactions of acidic Cl-bearing groundwater with Fe(II) sulfides. Akaganeite in Yellowknife Bay, Gale Crater, could have formed by Fe(II) oxidation–hydrolysis either as a sole Fe(III) (hydr)oxide at pH < 2 or along with ferrihydrite and hematite at 2 < pH < 4 under Si-enriched conditions. Akaganeite formation at the Vera Rubin ridge, Gale Crater, could have occurred through oxidative alteration of sulfides in Cl-bearing pH 1.2–1.5 solutions. The presence of well-crystallized akageneite in the Rock Hall site at the Vera Rubin ridge indicates that Fe(II) oxidation–hydrolysis contributed to akageneite formation.

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Evolution of pyrite oxidation from a 10-year kinetic leach study: Implications for secondary mineralisation in acid mine drainage control

Fan

Qian

et al. 2022

Chemical Geology

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Characterization of the effects of silicon on the formation of goethite

Cited by 16 publications

References 17 publications

Mineralogical characteristics of the superlarge Quaternary bauxite deposits in Jingxi and Debao counties, western Guangxi, China

Mineralogical characteristics of the superlarge Quaternary bauxite deposits in Jingxi and Debao counties, western Guangxi, China

Formation of Fe(III) (Hydr)oxides from Fe(II) Sulfides: Implications for Akaganeite Detection on Mars

Evolution of pyrite oxidation from a 10-year kinetic leach study: Implications for secondary mineralisation in acid mine drainage control

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