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Related to limonite: goethite
Any of a group of widely occurring yellowish-brown to black iron oxide minerals, essentially FeO(OH)·nH2O, used as a minor ore of iron.
[Originally, bog iron ore, from German Limonit (coined on the model of German Wiesenerz : Wiesen, meadow + Erz, ore) : Greek leimōn, meadow, moist grassy place (of unknown origin) + German -it, -ite (from Latin -ītēs; see -ite1).]
li′mo·nit′ic (-nĭt′ĭk) adj.
(Minerals) a common brown, black, or yellow amorphous secondary mineral that consists of hydrated ferric oxides and is a source of iron. Formula: FeO(OH).nH2O
[C19: probably from Greek leimōn, translation of earlier German name, Wiesenerz meadow ore]
a brown-to-yellow mineral mixture, mostly noncrystalline iron hydroxide with hematite and goethite: an ore of iron.
[1815–25; < Greek leimṓn meadow + -ite1 (so called from its typical location, in bogs or wet meadows)]
li`mo•nit′ic (-ˈnɪt ɪk) adj.