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