Rock phosphate
| Color | Brown, gray, or black |
| Texture | Granular or powdery |
| Particle Size | Typically ranges from 1 mm to 75 mm |
| Density | 1.4 to 1.8 g/cm3 (varies with moisture content) |
| Melting Point | Decomposes at high temperatures |
| Solubility | Insoluble in water |
| pH | 5.5 to 7.5 (neutral to slightly acidic) |
| Odor | Odorless |
| Chemical Formula | Ca5(PO4)3(OH,F,Cl) |
| Chemical Composition | 28-38% P2O5, 45-48% CaO, and various impurities |