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limonite

limonite (līm´ənīt) or brown hematite (hĕm´ətīt, hē´–), yellowish to dark brown mineral, a hydrated oxide of iron, FeO(OH)·nH2O, occurring commonly in deposits of secondary origin, i.e., those formed by the alteration of minerals containing iron. Both iron rust and bog iron ore are limonite. It serves as a pigment (see ocher) and as an ore of iron. It is found mainly in Austria and England.

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limonite

limonite Mineral, FeO(OH).nH2O; sp. gr. 2.7–4.3; hardness 4.0–5.3; yellowish-brown to reddish-brown; normally earthy lustre; usually amorphous; occurs as a secondary mineral from the weathering of iron in rocks and mineral deposits, and may accumulate to give iron-rich mineral deposits.

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