Phases reported to exist in the CaO-SiO2-Al2O3 system
Name Chemical formula Notation Stoichiometric composition, wt. %
Corundum Al2O3 - 100% Al2O3
Cristobalite SiO2 - 100% SiO2
Tridymite SiO2 - 100% SiO2
Quartz SiO2 - 100% SiO2
Calcium oxide CaO - 100% CaO
Mullite 3Al2O3 x 2SiO2 A3S2 28% SiO2, 72% Al2O3
Mullite 3CaO x Al2O3 C3A 62% CaO, 38% Al2O3
Mullite 12CaO x 7Al2O3 C12A7 48% CaO, 52% Al2O3
Mullite 5CaO x 3Al2O3 C5A3 48% CaO, 52% Al2O3
Mullite CaO x Al2O3 CA 35% CaO, 65% Al2O3
Mullite CaO x 2Al2O3 CA2 22% CaO, 78% Al2O3
Mullite CaO x 6Al2O3 CA6 8% CaO, 92% Al2O3
Pseudo-wollastonite Alpha CaO x SiO2 CS 48% CaO, 52% SiO2
Wollastonite Beta CaO x SiO2 CS 48% CaO, 52% SiO2
Para-wollastonite beta' CaO x SiO2 CS 48% CaO, 52% SiO2
Rankinite 3CaO x 2SiO2 C3S2 58% CaO, 42% SiO2
Rankinite Alpha 2CaO x SiO2 C2S 65% CaO, 35% SiO2
Bredigite Alpha' 2CaO x SiO2 C2S 65% CaO, 35% SiO2
Larnite Beta 2CaO x SiO2 C2S 65% CaO, 35% SiO2
Shannonite Gamma 2CaO x SiO2 C2S 65% CaO, 35% SiO2
Alite 3CaO x SiO2 C2S 74% CaO, 26% SiO2
Anorthite CaO x Al2O3 x 2SiO2 CAS2 20% CaO, 43% SiO2, 37% Al2O3
Gehlenite 2CaO x Al2O3 x SiO2 C2AS 41% CaO, 22% SiO2, 37% Al2O3
Grossularite 3CaO x Al2O3 x 3SiO2 C3AS3 37% CaO, 40% SiO2, 23% Al2O3
Ca-cordierite 2CaO x 2Al2O3 x 5SiO3 C2A2S5 18% CaO, 49% SiO2, 33% Al2O3



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