hematite

hematitic /hee'meuh tit"ik, hem'euh-/, adj.
/hee"meuh tuyt', hem"euh-/, n.
a very common mineral, iron oxide, Fe2O3, occurring in steel-gray to black crystals and in red earthy masses: the principal ore of iron.
[1535-45; < L haematites bloodstone < Gk haimatítes (lithós) bloodlike (stone). See HEMAT-, -ITE1]

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or haematite

Heavy and relatively hard oxide mineral, ferric oxide (Fe2O3), that constitutes the most important iron ore because of its high iron content and its abundance.

Much hematite (from the Greek word meaning "blood," for its red colour) occurs in a soft, fine-grained, earthy form called red ocher or ruddle. Red ocher is used as a paint pigment; a purified form, rouge, is used to polish plate glass. The world's largest production comes from the Hamersley Range in western Australia.

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also spelled  haematite (from the Greek word for “blood,” in allusion to its red colour) 
 heavy and relatively hard oxide mineral, ferric oxide (Fe2O3), that constitutes the most important iron ore because of its high iron content (70 percent) and its abundance. Many of the various forms of hematite have separate names. The steel-gray crystals and coarse-grained varieties have a brilliant metallic lustre and are known as specular iron ore; thin scaly types are called micaceous hematite. Much hematite occurs in a soft, fine-grained, earthy form called red ochre or ruddle. Intermediate between these types are compact varieties, often with a reniform surface (kidney ore) or a fibrous structure (pencil ore). Red ochre is used as a paint pigment; a purified form, rouge, is used to polish plate glass.

      The most important deposits of hematite are sedimentary in origin; the world's largest production (nearly 75,000,000 tons of hematite annually) comes from a sedimentary deposit: the Lake Superior district in North America. Other important deposits include Minas Gerais, Braz. (where the hematite occurs in metamorphosed sediments); Cerro Bolívar, Venezuela; Labrador; and Quebec. Hematite is found as an accessory mineral in many igneous rocks; commonly as a weathering product of siderite, magnetite, and other iron minerals; and almost universally as a pigmenting agent of sedimentary and other rocks. For detailed physical properties, see oxide mineral (table).

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Universalium. 2010.

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Look at other dictionaries:

  • Hématite — Catégorie IV : oxydes et hydroxydes[1] Hématite Rose de Fer Ouro Preto, Brésil (6x3,6 cm) …   Wikipédia en Français

  • hématite — [ ematit ] n. f. • 1558; ematite XIIe; lat. hæmatites, mot gr. ♦ Minér. Oxyde de fer naturel de couleur rougeâtre ou brune. Hématite rouge (⇒ ferret) . Hématite hydratée. ⇒ limonite. ♢ Pierre noire, d éclat métallique, formée de cet oxyde. Bague… …   Encyclopédie Universelle

  • Hematite — Hématite Hématite Général Nom IUPAC trioxyde de difer, Oxyde de fer rouge, Oxyde de fer jaune No CAS …   Wikipédia en Français

  • Hematite — Hem a*tite, n. [L. haematites, Gr. ? bloodlike, fr. a i^ma, a i matos, blood.] (Min.) An important ore of iron, the sesquioxide, so called because of the red color of the powder. It occurs in splendent rhombohedral crystals, and in massive and… …   The Collaborative International Dictionary of English

  • hematite — 1540s, haematites, from M.Fr. hematite (16c.), from L. haematites, from Gk. haimatites lithos bloodlike stone, from haima (gen. haimatos) blood (see EMIA (Cf. emia)). Earlier as emachite (late 14c.) …   Etymology dictionary

  • hematite — [hem′ə tīt΄, hē′mətīt΄] n. [L haematites < Gr haimatitēs, lit., bloodlike, red iron ore < haima, blood: see HEMO ] a reddish brown to black, rhombohedral mineral, Fe2O3, that is a major ore of iron; ferric oxide: see RED OCHER hematitic… …   English World dictionary

  • Hematite — For other uses, see Hematite (disambiguation). Hematite Hematite (blood ore) from Michigan (unknown scale) General Category …   Wikipedia

  • hématite — (é ma ti t ) s. f. Minerai de fer qui est un peroxyde de ce métal.    Hématite brune, nom donné à l hydroxyde de fer.    Adj. Pierre hématite. HISTORIQUE    XVIe s. •   Terre scellée, bol fin, pierre haematiste, coral, PARÉ XVIII, 66. ÉTYMOLOGIE… …   Dictionnaire de la Langue Française d'Émile Littré

  • hematite, US — hematitas statusas T sritis chemija apibrėžtis Mineralas. formulė Fe₂O₃ atitikmenys: angl. haematite, GB; hematite, US; red hematite; red iron ore rus. гематит; железный блеск; красный железняк …   Chemijos terminų aiškinamasis žodynas

  • HÉMATITE — s. f. Sanguine, mine de fer d un rouge brun. On dit aussi adjectivement, Pierre hématite …   Dictionnaire de l'Academie Francaise, 7eme edition (1835)

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