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Selected calcium phosphates and their respective chemical formula, molar Ca/P and ν1 P—O stretching in Raman spectroscopy. After Dorozhkin [32], Combes & Rey [7]; and Crane et al. [34].
| Mineral | Chemical formula | Ca/P | ν1 P-O stretching |
|---|---|---|---|
| Amorphous Calcium Phosphate (ACP) | Ca3(PO4)2xnH2O, n = 3 – 4.5 | 1.2 – 2.5 | 950 cm−1 |
| Octacalciumphosphate (OCP) | Ca8H2(PO4)6x5H2O | 1.33 | 955 cm−1 |
| Hydroxyapatite (HAP) | Ca5(OH)(PO4)3 | 1.67 | 960–962 cm−1 |
