chromite

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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 (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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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 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.