Byzanium

Byzanium is a blue fantasy fuel obtained from Byzanite.

It is a fuel.

Byzanium is from Clive Cussler's adventure novel; Raise the Titanic! It tells the story of efforts to bring the remains of the ill-fated ocean liner RMS Titanic to the surface of the Atlantic Ocean in order to recover a stockpile of an exotic mineral that was being carried aboard. That being, Byzanium.