Incorporated It is Bulgarian White Limestone. It ended up having rust spots so I wouldn't recommend it for showers. Use Architec Tile from Stone Source instead.
Natural stone shouldn't be your first choice in a steam shower, but the look and feel of stone is so appealing that it can be hard to pass up.Do your homework and only buy your stone from suppliers with long histories with their exporter. The installation of slabs in a steam shower is very tricky and best left to the pros.Tip: Make sure your drain line is sized properly if the shower is going to have multiple showerheads. A 2-inch drain usually isn't enough for more than one showerhead.