Slate Description: Slate is a metamorphic rock, usually formed deep below the earth's surface by heat and pressure. This sort of rock is formed in layers or strata. Because slate was formed in low heat and pressure some fossils can be found in slate; sometimes even microscopic remains of delicate organisms. Slate Colours: Slate paving is predominantly dark grey in colour with other shades adding interest. It is also available with extra gold, bronze and brown colours usually called Rustic colour. Its surface is fairly smooth although it does have a riven texture at times and can on occasions laminate slightly when first laid, however this is just the flaking of the layers from quarrying and will cease once the loose layers have been removed. It is very hardwearing, but exposed edges can be sharp.