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chromite

chromite (krō´mīt), dark brown to black mineral. It is an iron-chromium oxide, FeCr2O4, with traces of magnesium and aluminum. Its crystals are octahedral, but rare; it usually occurs as irregular, granular masses in association with igneous rocks, including ophiolites, which are segments of oceanic crust exposed on land by tectonic processes usually associated with plate convergence (see plate tectonics). Chromitite is an igneous rock composed chiefly of the mineral chromite. The only commercial source of chromium and its compounds, chromite is used in the manufacture of refractory materials. Principal countries producing chromite are South Africa, Zimbabwe, the Philippines, and Turkey.

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"chromite." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

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"chromite." The Columbia Encyclopedia, 6th ed.. . Retrieved May 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/chromite

chromite

chromite Member of the chromite group of minerals in the spinel group, Fe2+Cr2O4, along with magnesiochromite (MgCr2O4); sp. gr. 5.1; black; sub-metallic lustre; crystals cubic, but normally it is massive or a granular aggregate; occurs in basic and ultrabasic rocks. It is the primary source of chromium.

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"chromite." A Dictionary of Earth Sciences. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

"chromite." A Dictionary of Earth Sciences. . Encyclopedia.com. (May 24, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chromite

"chromite." A Dictionary of Earth Sciences. . Retrieved May 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chromite

chromite

chro·mite / ˈkrōˌmīt/ • n. a brownish-black mineral that consists of a mixed oxide of chromium and iron and is the principal ore of chromium.

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"chromite." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

"chromite." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (May 24, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/chromite-0

"chromite." The Oxford Pocket Dictionary of Current English. . Retrieved May 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/chromite-0

chromite

chromite Black mineral, ferrous chromic oxide (FeO.Cr2O3), separated from magma in the formation of igneous rock. It is weakly magnetic and opaque. Hardness 5.5; r.d. 4.6.

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"chromite." World Encyclopedia. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

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chromite

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"chromite." Oxford Dictionary of Rhymes. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

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"chromite." Oxford Dictionary of Rhymes. . Retrieved May 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/chromite