Soil type | Particle size | Particle shape (mm) | Distinguishable with naked eye | |
Granular soil | Gravel | 2 - 60 | Granular | Obviously |
Sand | 0.06 - 2 | Granular | Easily | |
Silt | 0.002 - 0.06 | Granular | Barely | |
Cohesive soil | Clay | <0.002 | Flat plate | Impossible |