Gravel & River Rock - Classic Rock Stone Yard- sells dense grade stones in south texas ,Gravel & River Rock Putting gravels or river rock in an area where grass doesn’t grow is an inexpensive way to make your muddy back yard look a little more stylish! The price of the stone …57 Stone Gravel | Concrete, Limerock, Granite Driveways57 stone is an aggregate material suitable for driveways, parking lots, construction site entrances, and pipe bedding among other things. The specifications are 1″ minus with very little powder.