Sand is a fine mineral that is found naturally due to the erosion of sandstones, or can be manufactured by processing sandstone or rock with similar qualities. It has a particle size passing the 9.5 mm (3/8”) sieve and almost passing the 4.75 mm (No. 4) sieve. Sand is mostly retained on the 75 µ m (No. 200) sieve. Sand is commonly used as a component of concrete, to enable water drainage, or to provide stability under concrete slabs, sidewalks, and driveways.