Rock 57 is equivalent to 1.2 tons (2400 lbs.) per cubic yard. Here's a list of building Stone & flagstone estimated coverage per ton from Stoneplus.com.
Granite Rock #57 is an aggregate used in for a variety of landscape projects.
It is mainly gray in color with some tint of blue. It is about the size of a quarter making it an excellent product to spread on driveways as a topcoat.
Because of the drainage properties of this stone, it stays relatively clean in your driveway keeping dirt and dust off your shoes and out of the house.
Whether your yard needs new plantings or a complete refresh, here are seven, must-know landscape design tips for the perfect garden shared by Bhg.com.