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| Compounds | Form of calcium orthophosphate | Chemical formula | Ca/P ratio |
|---|---|---|---|
| Stoichiometric | Dicalcium phosphate dihydrate | CaHPO4∙H2O (Brushite) | 1.0 |
| Octacalcium phosphate (OCP) | Ca3(HPO4)2(PO4)4∙5H2O | 1.33 | |
| α-tricakium phosphate (α-TCP) | Ca3(PO4)2 (whitelockite) | 1.5 | |
| Hydroxyapatite (HA) | Ca10(PO4)6(OH)2 | 1.67 | |
| Non-Stoichiometric | Amorphous calcium phosphate | ~1.45 |
