chromite


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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 tectonicsplate tectonics,
theory that unifies many of the features and characteristics of continental drift and seafloor spreading into a coherent model and has revolutionized geologists' understanding of continents, ocean basins, mountains, and earth history.
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). 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.

chromite

[′krō‚mīt]
(mineralogy)
FeCr2O4 A mineral of the spinel group; crystals and pure form are rare, and it usually is massive; the only important ore mineral of chromium. Also known as chrome iron ore.

chromite

1. a brownish-black mineral consisting of a ferrous chromic oxide in cubic crystalline form, occurring principally in basic igneous rocks: the only commercial source of chromium and its compounds. Formula: FeCr2O4
2. a salt of chromous acid
References in periodicals archive ?
Alongside that, we are actively advancing our chromite strategy with a view to completing a preliminary economic assessment outlining our preferred approach for moving development forward there as well," Coutts added.
Chen subsequently hauled and shipped chromite fines valued at more than P211 million Dh17.
The minister asserted that he had "no knowledge" about chromite ore being ferried in his vehicle.
Deputy Governor Mohammad Hashim Faizi told Pajhwok Afghan News a significant amount of chromite was illegally excavated in Logar and smuggled to Pakistan via southeastern Paktia province.
Industrial Minerals branded its chromite product SpheriChrome because of its spherical nature and uniform grain sizing.
No one has tried to mine for heavy minerals such as chromite, garnet and zircon on Oregon's southern coast since World War II, opponents say.
The researchers reacted chromite with birnessite, a manganese-containing mineral that often forms in weathered rocks and soils containing chromite.
Both alkali and tholeiitic basalts contain chromite as an early crystallizing phase, and form magnetite and/or ilmenite over a large range of temperatures.
that that the Chromite Tailings Retreatment Project produced its first
Positions Cliffs to Become Sole North American Primary Chromite and Ferrochrome Producer/Exporter