Black Quartz Stoneskin is a grey black Quartzite originating from China with a hand cleft surface. As the name STONESKIN suggests, this finish is achieved by using the “skin” of natural stone which is then bonded into a cladding about 1.5 to 3 cm thick and 60 x 15 cm in size. Stoneskin is a very easy to install natural stone cladding system that can be used internally and externally.