Chromite is a black submetallic mineral consisting of oxide of chromium and iron. It is slightly magnetic and the only ore of chromium. A common constituent of peridotite rocks and the serpentines derived from them. Also associated with corundum. One of the first minerals to separate from a cooling magma. Chromium is widely used in metal plating and in stainless steel. It has the formulae FeCr2O4 and a relative hardness of 6.
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