Original: In the Udden-Wentworth scale (due to Krumbein), silt particles range between and mm (3.9 to 62.5 Î 1\/4 m), larger than clay but smaller than a sand.
Simplified: Silt particles range between a and mm (3.9 to 62.5 Î 1\/4 m), larger than clay but smaller than a sand.