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Common ores of chromium include chromite, chromate, and crocoite. Chromite is the most significant ore of chromium and is widely used in the production of stainless steel.
Chromite is an iron chromium oxide: FeCr 2 O 4
Chromium is not a rock but a metallic element found in ores. It is typically extracted from mineral deposits such as chromite, which is a type of oxide mineral.
The correct compound for Cr2O3 is chromium(III) oxide, which is composed of two chromium atoms and three oxygen atoms.
Ruby is composed primarily of aluminum oxide (Al2O3) with trace amounts of chromium oxide (Cr2O3). The chromium impurities within the aluminum oxide lattice are responsible for the vibrant red color of ruby.