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Iron is a metal used on Earth for many purposes. It was one of many elements visible in the Alliance of Four Great Races database. (SG1: "The Torment of Tantalus")
Along with Carbon it is the main material used in ammunition for Firearms. (SG1: "Small Victories") The Naquadah asteroid's surface was made up Iron and Nickel. (SG1: "Fail Safe")