Travertine

Travertine is a terrestrial sedimentary rock. It is a natural chemical precipitate of carbonate minerals; aragonite or calcite. This happens from solution in ground and surface waters, and/or  geothermally heated hot-springs.Dictionary of geological terms, 1962. A Dolphin Reference BookA glossary of karst terminology, 1970. Geol. Surv. Water-Supply Paper 1899-K, U. S. Gov. Print. Off., Washington. Similar (but extremely porous) deposits formed from ambient-temperature water are known as tufa. 

The Colosseum built by the Romans, was made of travertine.

 References 


Category:Carbonate rocks