Travertine is a form of limestone deposited by mineral springs, especially hot springs. Travertine often has a fibrous or concentric appearance and exists in white, tan, cream-colored, and even rusty varieties. It is formed by a process of rapid precipitation of calcium carbonate, often at the mouth of a hot spring or in a limestone cave. It is frequently used as a building material.
Travertine is a terrestrial sedimentary rock, formed by the precipitation of carbonate minerals from solution in ground and surface waters, and/or geothermally heated hot-springs. Travertine forms from geothermal springs and is often linked to siliceous systems that form siliceous sinter. Macrophytes, bryophytes, algae, cyanobacteria, and other organisms often colonize the surface of travertine and are preserved, giving travertine its distinctive porosity.
Travertine is often used as a building material and also one of the most frequently used stones in modern architecture. It is commonly used for façades, wall cladding, flooring and additionally one of several natural stones that are used for paving patios and garden paths either as tile or paver.