自然铜 Traditional form: 自然銅 Pinyin (reading): zìrántóng Definitions: natural copper chalcopyrite copper iron sulfide CuFeS2 Characters: 自 - self; private, personal; from 然 - certainly; naturally; suddenly 铜 - copper, bronze Traditional characters: 自 - self; private, personal; from 然 - certainly; naturally; suddenly 銅 - copper, bronze