Hollinium

Hollinium was a material that could be found in veins underground. At one point during the Imperial Era, a vein of hollinium was discovered underneath a colony by a mining conglomerate, which paid off the Moff local to the colony so they would ignore the destruction of the colony at the hands of the conglomerate.

Text and facts from the “Hollinium” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.