A slate is a fine-grained metamorphic rock that splits into thin, smooth-surfaced layers, forming an essential building material used at a large scale in the construction of buildings. Slate tiles and slate stones are suitable for Exterior and Interior Applications such as wall-cladding, roofing, flooring etc. Slate Stones are known by many names such as grey slates, flags, flagstones, thackstones, slats, flatstones, stone tiles and tilestones.