<P> Important non-ferrous metals include aluminium , copper , lead , nickel , tin , titanium and zinc , and alloys such as brass . Precious metals such as gold , silver and platinum and exotic or rare metals such as cobalt , mercury , tungsten , beryllium , bismuth , cerium , cadmium , niobium , indium , gallium , germanium , lithium , selenium , tantalum , tellurium , vanadium , and zirconium are also non-ferrous . They are usually obtained through minerals such as sulfides , carbonates , and silicates . Non-ferrous metals are usually refined through electrolysis . </P>
is aluminium a ferrous or non ferrous metal
non-ferrous