The Kinetics of the nucleation of lead hydroxylapatite was studied from saturated solutions of lead and phosphorus at pH ∼ 12 and at a temperature of 37°C. The incipient phase precipitated was apatitic, and the process was one of crystal growth and perfection with time similar to Ostwald's crystal ripening process. The crystal growth and perfection phenomena is reflected from the 002 peak in XRD and the resolution of ν5(OH) and ν3(PO4) vibration in the IR spectra. The solid solutions of calcium—cadmium—lead hydroxylapatite were prepared from solutions at pH ∼ 12. The formation of the samples was confirmed by measurements of lattice constants and IR spectra. The ordered cation occupancy of 60 mole% (Cd + Pb) in the 6h apatite site is discussed. The existence of a hydrogen bonding mechanism in the samples of the solid solutions is observed.