The 'Granite' from Rapidan is the hardest stone I have carved to date. When Dulles Airport built their new runways, they searched for the hardest stone they could find for the asphalt... They chose Rapidan stone! The Jet Mist Quarry does cut large blocks for building projects. They do not blast the stone like gravel producing quarries in the area. Blasting creates fractures in the stone making it unusable for carving.