| Description | Fine, white, micro crystalline powder, odourless, tasteless |
| Solubility | Practically insoluble in water and in alcohol |
| Identification | Gives reaction of calcium salts & carbonates |
| Magnesium and Alkali Metals | NMT 1.0% |
| Iron | NMT 0.1% |
| Acid Insoluble Substances | NMT 0.2% |
| Arsenic | NMT 3 ppm |
| Barium | Complies to USP |
| Heavy Metals | NMT 20 ppm |
| Fluoride | NMT 50 ppm |
| Lead | NMT 3 ppm |
| Mercury | 0.5 µ/gm |
| Loss on Drying | NMT 2.0% |
| Assay | NLT 98.0% & NMT 100.5% |