Tetracalcium phosphate is the compound Ca4(PO4)2O, (4CaO.P2O5). It is the most basic of the calcium phosphates, and has a Ca/P ratio of 2, making it the most phosphorus poor phosphate. It is found as the mineral hilgenstockite, which is formed in industrial phosphate rich slag (called \"Thomas slag\"). This slag was used as a fertiliser due to the higher solubility of tetracalcium phosphate relative to apatite minerals. Tetracalcium phosphate is a component in some calcium phosphate cements that have medical applications.

CAS：1306-01-0
中文别名：
英文别名：Thomas phosphate;EINECS 215-143-6;Tetracalcium diphosphorus nonaoxide;
分子式：Ca4O9P2
分子量：366.254
精确质量：365.752
Psa：192.12
Logp：0.6532

UNII：CJ64N85J4S

蒸汽压：1.41mmHg at 25°C