Phases reported to exist in the FeO-SiO2-Al2O3 system
Name Chemical formula Stoichiometric composition, wt. %
Corundum Al2O3 100% Al2O3
Cristobalite SiO2 100% SiO2
Tridymite SiO2 100% SiO2
Quartz SiO2 100% SiO2
Wustite FeO 100% FeO
Mullite 3Al2O3 x 2SiO2 28% SiO2, 72% Al2O3
Grunerite FeO x SiO2 55% FeO, 45% SiO2
Fayalite 2FeO x SiO2 71% FeO, 29% SiO2
Hercynite FeO x Al2O3 41% FeO, 59% Al2O3
Almandine 3FeO x Al2O3 x 3SiO2 43% FeO, 37% SiO2, 20% Al2O3
Fe-cordierite 2FeO x 2Al2O3 x 5SiO2 22% FeO, 47% SiO2, 31% Al2O3




















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