Stone Base - Crab Orchard StoneStone Base Crab Orchard Stone Formed over the centuries in only one place on earth the Cumberland Plateau Crab Orchard stone is an especially hard, weather resistant variety of sandstone due to unusually high concentrations of silica. The stones exclusive buff, tan, blue gray and pink colors were created by a mixture of iron, titanium, and magnesium. And the yellow and brown swirls that give the stone its one of a kind appearance come from iron stains