In the Pre-Crisis continuity, depending on the particular dimension such as Earth-One, there were many forms and colors of Kryptonite, while others showed only one form such as Earth-Two and Earth-Three. As far as Earth-One and related alternate realitie
First mentioned in The Adventures of Superman radio show in June 1943, the material has been featured in a variety of forms and colors (each with its own effect) in DC Comics publications and other media, including feature films, television series, and novelty items such as toys and trading...