Bilitrium

Bilitrium is a rare, crystalline element that can be an incredibly powerful source of energy when combined with an antimatter converter.

In 2369, Bajoran Kohn-Ma terrorist Tahna Los, while aboard the runabout USS Yangtzee Kiang, rendezvoused with Lursa and B'Etor's Bird-of-Prey near the lower moon of Bajor VIII to buy a canister of bilitrium for thirteen kilograms of latinum. Combined with the antimatter converter he stole from the Cardassians, Tahna constructed a bilitrium explosive device aboard the runabout.

The USS Ganges, monitored the exchange from behind the second moon, attempted to intercept him, but Tahna threatened to detonate the bomb in low orbit and wipe out the colonies on the surface. The Ganges was forced to allow him to head towards the Bajoran Wormhole, where the device was detonated in the Gamma Quadrant without harming the wormhole or people. (DS9: "Past Prologue")

In 2370, while searching for the Duras sisters, Commander Riker recalled that they had tried to sell bilitrium at Deep Space 9. (TNG: "Firstborn")