Table 1: Chemical composition of some calcium phosphates minerals.

Ca:P Mineral name Formula Chemical use 1.0 Monetite CaHPO4 Dicalcium phosphate (DCP) 1.0 Brushite CaHPO4·2H2O Dicalcium phosphate dihydrate (DCPD) 1.33 — Ca8(HPO4)2(PO4)4·5H2O Octacalcium phosphate (OCP) 1.43 Whitlockisite Ca10(HPO4)(PO4)6 — 1.5 — Ca3(PO4)2 Tricalcium phosphate (TCP) 1.67 Hydroxyapatite Ca10(PO4)6(OH)2 — 2.0 — Ca4P2O9 Tetracalcium phosphate