Kernite

Kernite is a fairly common ore type that yields the largest amount of mexallon of any ore types in the world. Besides mexallon the Kernite also has a bit of tritanium and isogen. 400 units of ore are needed for refining.

m3: 1.2
Needed for refine: 400
Tritanium: 386
Mexallon: 773
Isogen: 386