Travertine is formed in hot springs and/or limestone caves. This stone is characterised by holes within it structure that result from carbon dioxide erosion. The amount of holes in travertine determines its appearance as well as hardness and it is used for the parameter for grading. Travertine tiles have the holes filled with material of the same colour as the parent rock but are relatively easy to tell.
Travertine tiles are suitable for indoor projects such as walls and floors while the pavers are suitable for outdoor projects such as pool decks and patio areas, driveways as well as walkways. This stone is not suitable for kitchen countertops because oil and highly pigmented liquids can penetrate and stain the stone.