| Samples | Surface area (m2/g) | Pore size (nm) | Pore volume (cm3/g) |
| Raw colemanite | 6.48 | 8.33 | 0.0135 |
| Conventional calcined (450°C) | 3.81 | 16.02 | 0.0153 |
| Microwave calcined (450°C) | 3.51 | 18.16 | 0.0159 |
| Conventional calcined (700°C) | 3.10 | 14.43 | 0.0112 |
| Microwave calcined (595°C) | 3.46 | 9.21 | 0.0080 |