Figure F3. Changes in expected phase distribution with decreasing sulfur and oxygen fugacity. The expected assemblages changes are polydymite (pd) + millerite (mi), millerite + pyrrhotite (po), pyrrhotite + pentlandite (pn), pentlandite + magnetite (mt), magnetite + awaruite (aw), and awaruite + heazelwoodite (hz). py = pyite, cpy = chalcopyrite.