Dilithium

Dilithium is an element that facilitates the efficient use of matter-antimatter reactions and is one of few materials known to Federation science to be nonreactive with antimatter when subjected to a high-frequency electromagnetic field. Dilithium deposits grow in perfectly aligned lattices and can generally be found on small moons or planets. These deposits are highly sought after among star faring species.

Common use:
Is an element that facilitates the efficient use of matter-antimatter reactions, which makes it perfect for starships.