Cement, particularly Portland cement, is primarily composed of clinker, which is made by burning limestone and clay. The main chemical compounds formed in the clinker are calcium silicates (like C₃S - Alite, and C₂S - Belite) and calcium aluminates (like C₃A - Aluminate phase, and C₄AF - Ferrite phase). Calcium sulfoaluminate phases can also be present in certain types of cement (like sulfoaluminate cements) or form during the hydration of Portland cement (e.g., ettringite is a hydrated calcium sulfoaluminate). Therefore, calcium silicate, calcium aluminate, and calcium sulfoaluminate are all components or relevant phases found in cement or its hydration products.