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Although chromium occurs in many minerals, the only ore exploited commercially is chromite. This spinel mineral is ideally composed of ferrous oxide and chromic oxide with the chemical composition FeO · Cr 2 O 3, but it is often found in nature with magnesia (MgO) substituting for FeO and alumina (A1 2 O 3) or ferric oxide (Fe 2 O 3)
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Chromite is an iron chromium oxide: FeCr2O4. It is an oxide mineral belonging to the spinel group. Magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite; substitution of aluminium occurs leading to hercynite. It is by far the most industrially important mineral for the production of metallic chromium,
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