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Limonite
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<p>Limonite is an <a href="/facts/Iron_ore/rQMEvgMh">iron ore</a> consisting of a mixture of <a href="/facts/Hydrate/dev82l69">hydrated</a> <a href="/facts/Iron(III)_oxide-hydroxide/YpW6aAAS">iron(III) oxide-hydroxides</a> in varying composition. The generic formula is frequently written as FeO(OH)·<i>n</i>H2O, although this is not entirely accurate as the ratio of <a href="/facts/Oxide/DXtoVe1C">oxide</a> to <a href="/facts/Hydroxide/zW0wxpWD">hydroxide</a> can vary quite widely. Limonite is one of the three principal <a href="/facts/Iron_ore/rQMEvgMh">iron ores</a>, the others being <a href="/facts/Hematite/716YBzGr">hematite</a> and <a href="/facts/Magnetite/SVxoGUs2">magnetite</a>, and has been <a href="/facts/Mining/g6uDIFab">mined</a> for the production of <a href="/facts/Iron/QK1JYy8E">iron</a> since at least 400 BC. </p>