Chromite

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.

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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. Chromite is the chief ore of chromium.

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Oxide: An oxide is a chemical compound of oxygen with other chemical elements. In the 18th century, oxides were named calxes or calces after the calcination process used to produce oxides. Calx was later replaced by oxyd....

Mineral: This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band)....

Spinel: The spinels are any of class of minerals which crystallize in the isometric system with an octahedral habit. The general formula is as (X2+)(Y3+)2(O2-)4, with X representing a divalent cation and Y a trivalent cation. The bivalent cations may be Mg, Zn, Fe and Mn, and the trivalent oxides may be Al,...