anthophyllite GQdgform kelvins 56QdgC temperature Glaucophane LCST endmember eutectoid 28QdgC analcime 89QdgF 106QdgF 29QdgF 90QdgC recrystallizes 37QdgC 20QdgC 120QdgC endmembers 18QfC hedenbergite 77QdgF periclase TQundH Co3O4 NaAlSi3O8 liquidus 70QdgF 72QdgF millikelvins supercooling anorthoclase 78QdgF 8QdgC occurs TQunde 66QdgF