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Hydrous iron oxides, also called hydrous ferric oxides, are a class of minerals that form from the weathering of minerals that contain iron (Fe) and hydroxides (OH-), but not water. They are poorly crystalline, highly porous and have large surface areas. They usually occur as very small particles and tend to become more crystalline as they age because they are unstable. They have an affinity for organic and inorganic pollutants, which has led to an interest in using them as sorbents for pollution. Hydrous iron oxides include akaganéite, anhydrous iron oxide, feroxyhyte, goethite, lepidocrocite and limonite.
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