Zelebium

Zelebium was a substance used for the construction of contact points for the inertial guidance systems of class 9 cargo vessels. If these points were not properly maintained, over time, they could fuse together from the effects of corrosion. Under those conditions, the guidance system experienced a burn out.

In early 2365, Captain Thadiun Okona's ship, the Erstwhile, experienced such an event. For the repair of his guidance system, the chief engineer of the starship USS Enterprise (NCC-1701-D), Lieutenant Geordi La Forge, replaced the zelebium with tricellite.