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Travertine is a form of limestone which has been precipitated from carbonate rich hot springs. This example is from Yorkshire.
Travertine is a form of limestone deposited by mineral rich springs, especially hot springs. Travertine often has a fibrous or concentric banded appearance. It is formed by the rapid precipitation of calcium carbonate, often at the margins of a hot spring or in a limestone caves. Here it can give rise to the usual cave features. It tends to be much more dense & compact than it's porous counterpart, Tufa. Travertine is normal white or buff in colour but can range through to orange & brown. It is extracted & used as a decorative stone e.g. tiles. Pamukkale in Turkey (Unesco World Heritage Site) is a spectacular example of travertine terraces. This particular example is from Yorkshire. Each specimen is suppied in alabelled card tray.