| Property | Specification |
| Appearance | Reddish-brown, white, yellow, or gray lumps |
| Form | Lumps, powder, or granules |
| Bulk Density | 2.5 – 3.5 g/cm³ |
| Specific Gravity | 2.5 – 3.5 |
| Hardness (Mohs Scale) | 1 – 3 |
| Moisture Content | 5% – 15% (varies depending on source) |
| Particle Size | As required (commonly 0–50 mm) |
| Alumina (Al₂O₃) Content | 30% – 60% |
| Silica (SiO₂) Content | 1% – 12% |
| Iron Oxide (Fe₂O₃) | 2% – 25% |
| Color | Red, brown, yellow, or gray |
| Odor | Odorless |
| Melting Point | Does not melt; decomposes |
