CHROMIC ACID

(H.Cr0O.), an acid formed like sulphuric acid from a trioxide (CrO;); forms Chromates with the formula K:CrO,.. Other salts are known as Bichromates and Tri chromates according as the combining metal has one or two additional molecules of the trioxide; thus a bichromate would be XCr.07. CHROMITE, CHROMIC - IRON ORE (FeCr.0.), iron-black mineral, occurring in compact or granular ma es or as octahedral crystals in the Urals, New Zealand, U.S.A., and Unst. It is the chief source of chromium and its compounds.