Slate is a metamorphic rock formed from the low-grade regional metamorphism of shale. It contains foliated layers of fine dark grey to black mica. A bit brittle in nature, it’s not as durable as some other stones like marble or granite and can be pretty sharp around the edges. However, it is non-porous making it great for showers, sinks, and outdoor applications. Throughout the years, it has been used to make chalkboards, roofing tiles, flooring, and outdoor pavers.