Brittle metal is a term used to describe metals that are easily broken or fractured due to their low ductility. Two examples of brittle metals are ZINC and COBALT, both of which have been used in various applications throughout history. ZINC, with four letters, is a bluish-white metal that is often used as a protective coating for steel and iron. COBALT, with six letters, is a silvery-gray metal that has been used in the production of magnets, batteries, and jet engines.