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Iron oxides are chemical compounds composed of iron and oxygen. All together, there are sixteen known iron oxides and oxyhydroxides.[1]
Iron oxides and oxide-hydroxides are widespread in nature, play an important role in many geological and biological processes, and are widely used by humans, e.g., as iron ores, pigments, catalysts, in thermite (see the diagram) and hemoglobin. Common rust is a form of iron(III) oxide. Iron oxides are widely used as inexpensive, durable pigments in paints, coatings and colored concretes. Colors commonly available are in the "earthy" end of the yellow/orange/red/brown/black range. When used as a food coloring, it has E number E172.
Several species of bacteria, including Shewanella oneidensis, Geobacter sulfurreducens and Geobacter metallireducens metabolically utilize solid iron oxides as a terminal electron acceptor, reducing Fe(III) oxides to Fe(II) containing oxides.[4]
International Standard Serial Number, Brill's New Pauly, John Peter Oleson
Nitrogen, Hydrogen, Helium, Sulfur, Fluorine
Hydrogen, Chemistry, /anic Chemistry, Oxygen, Dictionary of chemical formulas
Oxygen, Carbon, Chromium, Nitrogen, Iron
Gold, European Union, Australia, New Zealand, Caramel coloring
Nickel, Cretaceous, Angkor Wat, Basalt, Tin
Color, Red, Black, Camouflage, Yellow