Groups of iron bearing minerals: 1) Oxides iron(II) oxide, wüstite (FeO) iron(II,III) oxide, magnetite (Fe3O4) iron(III) oxide (Fe2O3) - alpha phase, hematite (α-Fe2O3) - beta phase, (β-Fe2O3) - gamma phase, maghemite (γ-Fe2O3) - epsilon phase, (ε-Fe2O3) 2) Hydroxides -iron(II) hydroxide (Fe(OH)2) - iron(III) hydroxide (Fe(OH)3), (bernalite) 3) Oxide/hydroxides - iron(III) oxide-hydroxide goethite (α-FeOOH), akaganéite (β-FeOOH), lepidocrocite (γ-FeOOH), feroxyhyte (δ-FeOOH), 4) iron-sulfide Fe(II) - chemical compound of iron and sulfur Pyrrhotite Greigite Troilite The formation of these inorganic compounds initially involves the aerobic weathering of primary rocks in terrestrial and marine systems. This process might be followed by redistribution between compartments (e.g., hydrosphere and lithosphere) and may involve mechanical transport by wind and/or water. Iron-metabolizing microorganisms, which catalyze the oxidation or reduction of iron, also play a significant role in the cycling of iron in the environment and between compartments.
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