 Eastern regions are rich in chalcopyrite, nickel oxide, chromite and magnetite ores, as well as in coal (Chelyabinsk Oblast), bauxite, gold and platinum.Western Ural contains deposits of coal, oil, gas and potassium salts.The speciality of Urals is precious and semi-precious stones, such as emerald, amethyst, aquamarine, jasper, rhodonite, malachite and diamond.