... -2000 certification Sandstone from xiamen Qixing stone Natural sandstone is a sedimentary rock, and is composed mainly of uncolored quartz, ... Over time, these layers of sand get compressed and eventually turns into solid rock. Qixing takes pride in bringing in the rarest ... , green, yellow, gray, white, purple, maroon(chocolate), and is a result of the binding material and its percentage constituent. The ...