From Arizona Tile's website...
"Durango travertine is a sedimentary stone formed in hot springs which is comprised of calcite calcium carbonate.
All travertines have cavities that were created when the carbon dioxide bubbles were trapped as the stone was being formed. When you are shopping for travertine you will see "filled" and "unfilled" travertine. If the stone is "unfilled" they just left those small cavities open at the quarry. When you have the tile or slab installed most people have those cavities filled with grout or cement.
If they stone is "filled" this means that the cavities were filled at the quarry with cement. Depending on the time of year and how much moisture is in the air the tone of the fill can vary and will affect the color of the stone."
|Photo: Glass Tile Gallery.|
Other names for Durango travertine are: Torreon Stone, Paredon and Sombreretillo.
You will also find quite a few different styles of sinks made from Durango travertine. Durango travertine is available in 2 cm and 3 cm slabs and almost any size of tile you can think of. It is also commonly used in listelles and mosaics.