Classic Travertine
Travertine is formed in areas where carbon dioxide-rich water percolates through rocks in limestone areas; the water dissolves the limestone and becomes saturated with it. When the water resurfaces later, the sudden drop in pressure and the change in temperature cause the water to release the carbon dioxide gas. The calcium carbonate then recrystallises, often over minute underwater plants. The resulting rock is typically quite porous.
The worldâs largest travertine structure is the Coliseum in Rome.
The naturally occurring imperfections in the stone can be filled with grout to create an even surface and then the surface honed by a mechanical process leaving a matt/satin finish. Travertine may also be tumbled, leaving the natural undulation of the stone and exaggerating the impression of years of wear and tear.