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.
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