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hematite
hematite (haematite, iron glance, kidney ore, red iron ore, specularite) Iron mineral, Fe2O3; one of the main ores for iron; sp. gr. 4.9–5.3; hardness 5–6; trigonal; steel-grey to black, often iridescent, compact varieties dull to bright red; red to reddish-brown streak; metallic lustre; crystals tabular or rhombohedral with curved, striated faces, also occurs as columnar, mammillated, and botryoidal masses; no cleavage; widely distributed as an accessory mineral in igneous rocks, hydrothermal veins, as a rock-forming mineral in sedimentary rocks, as a primary mineral, as concretions or a cementing agent, and as a replacement for other minerals. Bedded ores of hematite form huge deposits in the Precambrian of N.America and elsewhere. See BANDED IRON FORMATION (BIF).
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AILSA ALLABY and MICHAEL ALLABY. "hematite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "hematite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O13-hematite.html AILSA ALLABY and MICHAEL ALLABY. "hematite." A Dictionary of Earth Sciences. 1999. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-hematite.html |
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hematite
hematite , mineral, an oxide of iron, Fe 2 O 3 , containing about 70% metal, occurring in nature in red to reddish-brown earthy masses and in steel-gray to black crystalline forms. Hematite that has a metallic luster is called specular hematite, or specular iron. The red powdered hematite is used as a pigment ( ocher ) and as rouge in polishing. Hematite is the most important ore of iron. Extensive and richly productive deposits occur in the Lake Superior region (Michigan, Minnesota, and Wisconsin) and the Birmingham district (Alabama). The mineral is widely distributed throughout the world and is responsible for the red coloration of many sedimentary rocks. See limonite . |
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"hematite." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "hematite." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1E1-hematite.html "hematite." The Columbia Encyclopedia, 6th ed.. 2008. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-hematite.html |
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hematite
he·ma·tite / ˈhēməˌtīt/ (Brit. hae·ma·tite) • n. a reddish-black mineral consisting of ferric oxide. It is an important ore of iron. |
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"hematite." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "hematite." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O999-hematite.html "hematite." The Oxford Pocket Dictionary of Current English. 2009. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-hematite.html |
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hematite
hematite One of the most important iron ores, containing mainly ferric oxide, Fe2O3. Containing 70% iron by weight, it occurs in several forms and from steel-grey to black in colour.
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Cite this article
"hematite." World Encyclopedia. 2005. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "hematite." World Encyclopedia. 2005. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O142-hematite.html "hematite." World Encyclopedia. 2005. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-hematite.html |
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