Natural round stone taken right from the ground here on L.I. Our gravel is 3/4" in size and is used primarily for structural jobs such as footings and foundations.
Grit is just a smaller size gravel 3/8" in size. It is used primarily for flatwork. Walkways, patios, driveways etc.
Crushed Natural Bluestone comes in 3/4 in and 3/8 in.
This stone is a type of stone which is baked in a kiln to produce a stone that is much lighter. It is primarily used for high rises or buildings that have concrete floors above the main floor.