Black limestone paving has a naturally riven surface with sawn sides. Although riven, the material tends to be flatter on its surface than sandstone which sits well in contemporary and traditional enviroments. Limestone is a sedimentary rock consisting of calcium carbonate, often containing magnesium and a little iron. Limestones mainly derive from the accumilated skeletons of marine organisms. The material is strong and durable and ideal for internal and external use. Limestone paving is suitable for pathways, garden patios, public areas and kitchen flooring.