Plagioclase

Plagioclase is not amongst the most valuable ore types around, but it has the largest amount of pyerite of any ore and is thus always in constant demand. It also yields some tritanium and mexallon. It requires 333 ore units to refine.

m3: 0.35
Needed for refine: 333
Tritanium: 256
Pyerite: 512
Mexallon: 256