Bronzium is a durable bronze-colored metal used in the Star Wars universe. Its most notable use has been in the Trade Federation droideka battle droids, whose tough layers of bronzium armor supplemented by optional reflective deflector shielding and twin dual blasters make them formidable enemies. It also appears as an armor type in KotOR II. Bronzium also is mentioned in the Alec Baldwin 1994 movie, The Shadow, as a metal so rare it is considered mythical—yet, in that film, a chemist was able to identify it in his basement lab and knew a considerable amount about its molecular structure. It is supposedly so unstable that it could be used to make an atomic bomb.
Read more about this topic: List Of Star Wars Substances