| Characteristics | Kieserite | Dolomite |
| Total MgO (%) | 27 - 29 | 18 - 22 |
| MgO (%) | 17.56 | 13.18 |
| Other Nutrient (%) | S = 22 | CaO = 30 |
| Water solubility | Fairly | Hardly |
| Reaction | Slightly acid | Alkaline |