Feb 15, 2016 . pebble gravel sand making machine mineral processing equipment . plant basalt stone silica sand manufacturers machine, quarry for crusher.
Gravel /ˈɡrævəl/ is a loose aggregation of rock fragments. Gravel is classified by particle size range and includes size classes from granule- to boulder-sized fragments. In the Udden-Wentworth scale gravel is categorized into granular gravel (2 to 4 mm or 0.079 to 0.157 in) and pebble gravel (4 to 64 mm or 0.2 to 2.5 in). . In American English, small stones without sand mixed in are known as.