discovery of a new element: phosphorus. See also List of fictional elements, materials, isotopes and subatomic particles Materials science in science fiction Dysprosium, a real element whose name means "hard to get" References External links World Wide Words — Unobtanium TV Tropes - Unobtainium Fictional materials Placeholder names Avatar (franchise) hu:Unobtainium#Unobtanium az Avatarban