The only ores of chromium are the minerals chromite and magnesio chromite.
The two main products of chromite refining are ferrochromium and metallic chromium; for those products the ore smelter process differs considerably.
For the production of ferrochromium the chromite ore (FeCr2O4) is reduced with either aluminium or silicon in an alumino thermic reaction and for the production of pure chromium the iron has to be separated from the chromium in a two step roasting and leaching process.
Chromite is also used as a refractory material, because it has a high heat stability.
The chromium extracted from chromite is used in chrome plating and alloying for production of corrosion resistant super alloys, nichrome, and stainless steel. Chromium is used as a pigment for glass, glazes, and paint, and as an oxidizing agent for tanning leather.