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- Tricalcium aluminate, 3CaO·Al2O3 (C3A)
- Dodecacalcium hepta-aluminate, 12CaO·7Al2O3 (C12A7)
- Monocalcium aluminate, CaO·Al2O3 (CA) (mayenite)
- Monocalcium dialuminate, CaO·2Al2O3 (CA2)
- Monocalcium hexa-aluminate, CaO·6Al2O3 (CA6)
In addition, other phases include:
- Dicalcium aluminate, 2CaO·Al2O3 (C2A), which exists only at pressures above 2500 MPa. The crystal is orthorhombic, with density 3480 kg·m−3.
- Pentacalcium trialuminate, 5CaO·3Al2O3 (C5A3), forms only under an anhydrous and oxygen free atmosphere. The crystal is orthorhombic, with a density of 3067 kg·m−3. It reacts rapidly with water.
- Tetracalcium trialuminate, 4CaO·3Al2O3 (C4A3), is a metastable phase formed by dehydrating 4CaO·3Al2O3·3H2O (C4A3H3).
- Cement chemist notation (CCN)
in which the following abbreviations for calcium and aluminium oxides are defined as:
- C = CaO
- A = Al2O3