XRD patterns of calcium phosphate precipitates obtained at different drifting (A) or constant (B) initial pH values (6.70, 7.50, 8.50 and 9.50) from solutions at 20.00 mmol·L⁻¹ phosphate concentration and 1.50 Ca/P molar ratio. The spectra are compared to diffraction patterns of HAP and brushite simulated from their respective crystal structures (ICSD files codes 22060 and 16132, respectively). Asterisk denotes possible traces of OCP.