Exonium

Exonium was a mineral that could be used to produce energy. The planet Rishi was rich in deposits of this mineral. The native Rishii used the mineral in food prep. More developed cultures used the mineral as power sources for things such as sonic weapons.

During the Clone Wars the Separatists invaded Rishi in order to obtain control over the exonium mining there. Kit Fisto lead a group of Clone troopers into a battle to regain control of the mines.

Appearances
Star Wars The Clone Wars: The Gauntlet of Death