garantal
Garantal is a fictional term used in speculative fiction to denote a rare mineral with luminescent properties. It does not correspond to any real mineral. In many works, garantal is described as a brittle silicate ore formed under high-pressure metamorphic conditions and recovered from deep subterranean deposits or from extraterrestrial crusts.
Descriptive properties vary by author, but common traits include a glassy luster, translucence, and a color
In fictional settings, garantal can function as a plot device to motivate exploration, trade, or political tension.
Etymology and naming practices show that the term garantal appears in various constructed languages and world-building
See also: fictional minerals, energy crystals, plot devices in speculative fiction.