Dilithium hydroxyl

A dilithium hydoxyl is a chemical compound containing dilithium, oxygen, and hydrogen.

In 2152, a Retellian freighter expelled a cloud of dilithium hydroxyls and ionized pyrosulfates into the Enterprise's path, clogging the plasma vents and preventing the Enterprise from engaging its warp drive. 

The Paulson Nebula is composed of 82% dilithium hydroxyls with magnesium and chromium. This allowed the USS Enterprise (NCC-1701-D) to use the nebular cloud to hide from the sensors of a Borg cube in 2366. 

Dilithium hydroxyl