| Description | White or almost white, crystalline powder |
| Solubility | Practically insoluble in cold water and in ethanol (96%). It dissolves in dil.hydrochloric acid and in dil. nitric acid. |
| Identification | A. Complies with the test for calcium. B. Complies with the test for phosphate. |
| Acid insoluble substances | NMT 0.2% |
| Arsenic | NMT 10 ppm |
| Barium | Complies with the best |
| Iron | NMT 400 ppm |
| Carbonate | No effervescence is produced |
| Chloride | NMT 0.25% |
| Sulphate | NMT 0.5% |
| Fluorides | NMT 100 ppm |
| Loss on Ignition | 24.5% - 26.5% |
| Assay | Between 98.0% and 105% |