Abstract: The whitlockite crystals were successfully deposited from the hydrothermal system with CaO, Mg(NO3)2 and H3PO4 at 180 ℃ within 2-4 h.According to the XRD analysis and SEM observation, it is showed that the sample consists mainly of monocrystal spherical aggregates of 5-15 μm in size, the XRD patterns and FTIR spectra were in agreement with the synthetic whitlockite (Ca19Mg2H2[PO4]14).

Key words: The whitlockite crystals were successfully deposited from the hydrothermal system with CaO, Mg(NO3)2 and H3PO4 at 180 ℃ within 2-4 h.According to the XRD analysis and SEM observation, it is showed that the sample consists mainly of monocrystal spherical aggregates of 5-15 μm in size, the XRD patterns and FTIR spectra were in agreement with the synthetic whitlockite (Ca19Mg2H2[PO4]14).