The particle size (in diameter) of coarse sand is

The particle size of coarse sand is about 0.2 - 2.0 mm (in diameter). Sand is the largest particle of the soil whereas clay is the finest one.
Soil texture is determined by the relative proportion of the three kinds of soil mineral particles, called soil separates i.e. sand, silt, and clay. These particles determine the properties like porosity, permeability, infiltration, shrink-swell rate, water holding capacity and susceptibility to erosion.