Tritanium
From Backstage Lore Wiki
Tritanium is one of the most common, and most needed minerals in New Eden. Everything from the Civilian Afterburner to the Ragnarok Titan consumes it in production, and for the truly large items an astronomical amount of Tritanium is needed.
The most common source of Tritanium is Veldspar. Other sources include Scordite, Pyroxeres, Plagioclase, Omber, Kernite, Jaspet, Hemorphite, Gneiss, Dark Ochre, Spodumain, Crokite and Arkonor.