A crystal is a type of clear mineral. The Traveler's homeworld had beautiful crystal cities. (TOS comic: "Dark Traveler") Types of crystalsEdit Acta crystal bioelectronic crystal Denevan crystal dilithium Iotian crystal Maraji crystal Metebelis crystal rubinitite crystal Tallonian crystal This article is a stub relating to a material or substance. You can help our database by expanding on it. Retrieved from "https://memory-beta.fandom.com/wiki/Crystal?oldid=607603" Categories: Memory Beta stubs (substances) Geology Materials and substances Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.