In the comics
Kryptonian crystals serve a huge role for Kryptonians. They are used as advanced technological devices which serve a variety of purposes, such as recording videos, storing computer data, and even storing the memories of someone, and they can be projected as a hologram. In the film Superman Returns, Lex Luthor used Kryptonian crystals to grow a new continent.
- ↑ As seen in The Menace of the White Dwarf.
- ↑ The crystals were shown in a flashback and in a video bank picture in The Menace of the White Dwarf. They are never referenced, just shown.