
| Standards | |
| UK and European | EN13752 |
| Physical Characteristics | |
| Specific Gravity | 3.50 - 4.00 |
| Bulk Density | 2.00 tonnes/m3 |
| Hardness | 4 - 5 Moh |
| Appearance | Black, granular |
| Chemical Analysis | |
| MnO | 75 - 80% |
| Standard Grades | |
| BS 18/44 | 0.35 - 0.85 mm |
| BS 16/30 | 0.50 - 1.00 mm |