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Benamite is a chemical element that was known to Federation science by the 24th century, a rare type of crystal used in quantum slipstream drives.
In the year 2375, the USS Voyager used benamite in its quantum slipstream drive, though the crystal did not last long. (VOY episode: "Timeless")
Starfleet's Vesta-class starships used benamite powered slipstream drives in the 2380s decade. (DTI novel: Watching the Clock)