limonite

limonite
—limonitic /luy'meuh nit"ik/, adj.
/luy"meuh nuyt'/, n. Mineral.
an amorphous hydrated ferric oxide, varying in color from dark brown to yellow, used as an ore of iron.
[1815-25; < Gk leimón meadow + -ITE1]

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One of the major iron minerals, a hydrous ferric oxide of variable composition.

Often brown and earthy, it is formed by alteration of other iron minerals, such as the hydration of hematite or the oxidation and hydration of siderite or pyrite.

Limonite (left) from Ironwood, Mich., and (right) from Montgomery, Pa.

Courtesy of the Field Museum of Natural History, Chicago; photograph, John H. Gerard/EB Inc.

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      one of the major iron minerals, hydrated ferric oxide (FeO(OH)·nH2O). It was originally considered one of a series of such oxides; later it was thought to be the amorphous equivalent of goethite and lepidocrocite, but X-ray studies have shown that most so-called limonite is actually goethite.

      The name limonite properly should be restricted to impure hydrated iron oxide (with variable water content) that is colloidal, or amorphous, in character. Often brown and earthy, it is formed by alteration of other iron minerals, such as the hydration of hematite or the oxidation and hydration of siderite or pyrite. It probably bears the same relationship to iron oxides that wad and gummite do to manganese and uranium oxides. Compare goethite.

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Universalium. 2010.

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  • Limonite — is an ore consisting in a mixture of hydrated iron(III) oxide hydroxide of varying composition. The generic formula is frequently written as FeO(OH)·nH2O, although this is not entirely accurate as limonite often contains a varying amount of oxide …   Wikipedia

  • limonite — [ limɔnit ] n. f. • 1842; de 1. limon ♦ Minér. Hydroxyde naturel de fer, brun, opaque, présent dans les minerais d hématite. ● limonite nom féminin (de limon 1) Minerai de fer, qui est un oxyde ferrique hydraté naturel d aspect le plus souvent… …   Encyclopédie Universelle

  • Limonite — Chapea …   Wikipédia en Français

  • Limonite — Li mon*ite (l[imac] m[o^]n*[imac]t), n. [Gr. leimw n any moist grassy place, a meadow: cf. F. limonite, G. limonit.] (Min.) Hydrous sesquioxide of iron, an important ore of iron, occurring in stalactitic, mammillary, or earthy forms, of a dark… …   The Collaborative International Dictionary of English

  • limonite — s. f. Óxido de ferro hidratado, de cor castanha amarelada.   ♦ Grafia no Brasil: limonita …   Dicionário da Língua Portuguesa

  • limonite — [lī′mə nīt΄] n. [< Gr leimōn, meadow, orig., low ground (for IE base see LIMB1) + ITE1] a brownish, amorphous mineral mixture of several iron oxides, esp. goethite, used as a coloring agent: sometimes an ore of iron: cf. YELLOW OCHER limonitic …   English World dictionary

  • limonite — (li mo ni t ) s. f. 1°   Terme de minéralogie. Sorte de minerai de fer, appelé par Haüy fer oxydé géodique, et dit aussi aétite.    Limonite oolithique, variété de limonite. 2°   Terme de géologie. Couche de limon …   Dictionnaire de la Langue Française d'Émile Littré

  • limonite — li·mo·nì·te s.f. TS mineral. miscela di minerali microcristallini dati da ossidi di ferro idrati, di colore variabile da bruno a giallo e aspetto terroso {{line}} {{/line}} DATA: 1839. ETIMO: dal fr. limonite, der. di limon melma …   Dizionario italiano

  • limonite — limonitas statusas T sritis chemija apibrėžtis Mineralas. formulė FeO(OH)·nH₂O atitikmenys: angl. bod are; iron are; limonite rus. бурый железняк; гидрогетит; лимонит; озерная руда …   Chemijos terminų aiškinamasis žodynas

  • limonite — noun Etymology: German Limonit, from Greek leimōn wet meadow; akin to Greek limnē pool Date: 1823 a native hydrous ferric oxide of variable composition that is an ore of iron • limonitic adjective …   New Collegiate Dictionary

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