Table 1 Classification of soil particles.1
Particle Diameter (mm)
Coarse sand 0.5-1
Medium sand 0.25-0.5
Fine sand 0.1-0.25
Very fine sand 0.05-0.1
Silt 0.002-0.05
Clay <0.002
1The International Classification (Atterberg) System refers only to soil particles under 2 mm:
Coarse sand 0.2-2 mm
Fine sand 0.02-0.2
Silt 0.002-0.02
Clay <0.002

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