Slate and Quartzite give commercial, institutional and office buildings a natural, yet elegant appearance. They feature unique surfaces that complement a variety of interior and exterior architecture. Both are metamorphic rocks that can be used for many purposes in commercial tile building projects. Slate contains mica flakes displaying unique patterns in every tile and is often used for flooring because of its durability, as well as its sleek look.  Often used for exterior entrances and terraces, Quartzite can add a natural elegance to interior corridors, offices, and reception areas.