Phases reported to exist in the MgO-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
Periclase MgO 100% MgO
Spinel MgO x Al2O3 28% MgO, 72 % Al2O3
Mullite 3Al2O3 x 2SiO2 28% SiO2 x 72% Al2O3
Enstatite MgO x SiO2 40% MgO, 60% SiO2
Forsterite 2MgO x SiO2 57% MgO, 43% SiO2
Cordierite 2MgO x 2Al2O3 x 5SiO2 14% MgO, 51% SiO2, 35% Al2O3
Pyrope 3MgO x Al2O3 x 3SiO2 30% MgO, 25% SiO2, 45% Al2O3
Sapphirine 4MgO x 5Al2O3 x 2SiO2 20% MgO, 15% SiO2, 65% Al2O3
Osumilite MgO x Al2O3 x 4SiO2 10% MgO, 63% SiO2, 27% Al2O3
Petalite MgO x Al2O3 x 8SiO2 7% MgO, 77% SiO2, 16% Al2O3
















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