Aug 24, 2018 · Check out the basic materials that fabricate gravel. Crushed Granite Gravel. This is any gravel product that is crushed from a larger rock in a quarry. The large pieces have sharp edges that help it stay in place, especially for driveways and walks on a gentle slope. It also offers a nice, natural look for your yard.
Gravel used for erosion control comes from mines and quarries. These small but sturdy rock types are for layering and holding soil in place, just like mulch would be used to hold a new tree in place. To be used as soil erosion control , the gravel needs to be hewn from natural stone that is porous such as sandstone because this allows water to soak through the tiny capillaries within the rock and get to the soil.