Chromite, Iron Magnesium Chromium Oxide: (Fe, Mg)Cr₂O₄, is an Oxide mineral belonging to the spinel group. Magnesium is always present in variable amounts, also aluminium and iron substitute for chromium. Chromite is found in peridotite and other layered ultramafic intrusive rocks and also found in metamorphic rocks such as Serpentinites. Ore deposits of Chromite form as early magmatic differentiates. It is commonly associated with Olivine, Magnetite, Serpentine, and Corundum. The vast Bushveld igneous complex of South Africa is a large layered mafic to ultramafic igneous body with some layers consisting of 90% Chromite making the rare rock type, Chromitite.