Terrazine

It's clearly related to vespene gas, but there are some very exotic organics added into the mix.

Description

Terrazine gas is a potent psionic reagent. It is sought by protoss, zerg and terrans alike.

Terrazine is similar to vespene gas, and contains additional organic substances, though is not as flammable. Without special preparation and containers, samples don't last long and visually, it is purple and misty green. Terrazine is extremly rare only to be found deep undergrond.