Cu - a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductormetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. bornite, peacock ore - a mineral consisting of sulfides of copper and iron that is found in copper deposits cuprite - a mineral consisting of cuprous oxide that is a source of copper malachite - a green mineral used as an ore of copper and for making ornamental objects brass - an alloy of copper and zinc bronze - an alloy of copper and tin and sometimes other elements; also any copper-base alloy containing other elements in place of tin blister copper - an impure form of copper having a black blistered surface conductor - a substance that readily conducts e.g. electricity and heat |