A type of metamorphic rock, slate is one of the world’s most popular tile materials. This stunning stone boasts a fine grain and is available in a wide range of rich hues from coppery browns to deep blues and even pure black. Opt for slate tiles inside your home or use them outdoors for your paths and walkways. As a bonus, you can easily clean slate floors with a mild detergent. With so many slate options at your disposal, you’re sure to find one that matches your unique sense of style.