Crushed stone is produced by passing stones through a crushing machine at a quarry. Various types of stone are used in this operation, such as granite and limestone. At the bottom of the crushing machine lies a screen that traps the the crushed stone product (the finer material that passes through the screen is also kept and sold as stone dust).
Crushed rock or stone is a form of gravel often used for walkways and landscape borders, but it can make an efficient and costeffective patio. The sharp, irregular rocks gradually bind together under compaction to form a stable surface.