Slate is a fine-grained, foliated, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low grade regional metamorphism. The result is a foliated rock in which the foliation may not correspond to the original sedimentary layering. At Great Tile carry a a variety of slate colors, textures, sizes, and price points to cater to a wide range of specifications and budgets. Natural Slate tiles can be used on floors, walls, countertop and back splash installations.