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Travertine is a dense, banded rock composed of calcite (calcium carbonate, CaCO3). Formed by the evaporation of river and spring waters, it is a variety of limestone that has a light color and takes a good polish. It is often used for walls and interior decorations in public buildings.
The most important example of travertine application is the Colosseum in Rome. This travertine was quarried from Tibur (today Tivoli, a town about 20 Km from Rome) and it was used for the main pillars, the ground floor and the external wall.