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Common ferrous minerals Magnetite Fe 3 O 4 Pyrite FeS 2 Hydrolysis products

Fe +2. The Iron Cycle. Fe +3. Common ferrous minerals Magnetite Fe 3 O 4 Pyrite FeS 2 Hydrolysis products FeOH + , Fe(OH) 2 0. Common ferric minerals Iron hydroxide Fe(OH) 3 Goethite FeOOH Hematite Fe 2 O 3 Jarosite KFe 3 (SO 4 ) 2 (OH) 6. Weathering. Weathering.

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Common ferrous minerals Magnetite Fe 3 O 4 Pyrite FeS 2 Hydrolysis products

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  1. Fe+2 The Iron Cycle Fe+3 Common ferrous minerals Magnetite Fe3O4 Pyrite FeS2 Hydrolysis products FeOH+, Fe(OH)20 Common ferric minerals Iron hydroxide Fe(OH)3 Goethite FeOOH Hematite Fe2O3 Jarosite KFe3(SO4)2(OH)6 Weathering Weathering Precipitation Precipitation Thiobacillus ferrooxidans (strict acidophile) Gallionella ferroginea Leptrothrix ochracea Fe+2 in Solution pH 5 10-14 m/l pH 7 10-18 m/l Fe+3 in Solution pH 5 10-12 m/l pH 7 10-18 m/l Oxidation Reduction Shewenella putrefaciens Exists in solution as Fe+2 pH<6.75 FeOH+ pH>6.75 Fe+2 chelates Exists in solution as Fe+3 Fe(OH)2+(predominant) Fe+3 chelates Soil Solution Plant exudates Plant residue Plant uptake as Fe+2 form Plants Iron exists in plants as components of proteins enzymes cells

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