Volcanic Slate was developed from pieces of natural slate that lined the steps of the former Australian Parliament building in Melbourne. This mid-toned, cloudy gray slate has darker detailing and subtle tonal variation which adds depth to the overall design. Gravel-colored InteGrout™ completes the look and will not stain or discolor, unlike typical grout. Korlok Select stone tiles are quick and easy to fit and do not need to be sealed.