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Limonite is an iron ore consisting of a mixture of hydrated iron(III) oxide-hydroxides in varying composition. although this is not entirely accurate as the ratio of oxide to hydroxide can vary quite widely.
May also form as a pseudomorph after other minerals, especially Pyrite, Siderite, and Marcasite. As a secondary mineral formed from the alteration of iron minerals.Limonite in a ore of iron and is used as a pigment in the manufacture of paints