Limonite - WikipediaLimonite deposited from mine runoff. Galena and limonite. Limonite pseudomorphs after garnet. Limonite is an iron ore consisting of a mixture of hydrated iron(III) oxide-hydroxides in varying.what is limonite mined at,Limonite: an iron oxide used as pigment and iron ore - GeologyLimonite often forms as a precipitate at springs and mine openings where acidic, iron-laden waters emerge from the subsurface. Most subsurface waters contain.