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Iron-rich sedimentary rocks are sedimentary rocks which contain 15% or more iron However , The main iron ores are from the oxide group consisting of hematite, goethite, and magnetite The carbonate , In fresh water environments, siderite will replace carbonate shells instead of pyrite due to the low amounts of sulfate
For example, the oxidation of Fe2+ (ferrous ion) to Fe3+ (ferric ion) can be , the reduction of nitrate, then manganese, iron, sulphate, and carbon dioxide (Figure 1) , The absence of hematite and abundance of goethite in many soils of cool or.
Iron(II,III) oxide is the chemical compound with formula Fe3O4 It occurs in nature as the mineral magnetite It is one of a number of iron oxides, the others being iron(II) oxide (FeO), which is rare, and iron(III) oxide (Fe2O3) also known as hematite , iron(II) chloride and iron(III) chloride in the presence of sodium hydroxide