| Summary: | The characterization of a mixture consisting of four of outmost biologically significance calcium phosphates (hydroxyapatite, octacalcium phosphate, dicalcium phosphate dihydrate and dicalcium phosphate anhydrous) was attempted. The difficulty in this task lies in the similarity of their chemical and crystal structure. For the identification three spectroscopic techniques were applied: Raman spectroscopy, IR spectroscopy and X-ray powder diffraction (XRPD). Based on careful examination of the spectra, three approaches are proposed depending on instrument availability. One requires combination of IR and Raman information, the second IR and XRPD and the third only XRPD patterns before and after the heating the mixture at 850 oC.
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