Naquadah

Naquadah is a green fantasy fuel obtained from Naquadite.

It is a fuel. It lasts as long as a lava bucket.

Naquadah is from Roland Emmerich and Dean Devlin's military science fiction franchise; Stargate. It is a super-heavy mineral of unknown composition, and has superconducting properties. It can store massive amounts of energy and is extremely hard.