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travertine
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travertine Showing the presence of travertine, a CaCO3 precipitate of calcite or aragonite, speleothem (cave formation), in southwestern Virginia, U.S. Travertine terraces
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
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travertine
travertine

travertine

geology
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travertine, 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 colour and takes a good polish; it is often used for walls and interior decorations in public buildings. Travertine deposits along the Aniene River, near Rome, are several metres thick. In the United States the Mammoth Hot Springs in Yellowstone National Park, Wyoming, are actively depositing travertine. It also occurs in limestone caves in the form of stalactites and stalagmites, as, for example, in Carlsbad Caverns, New Mexico.

This article was most recently revised and updated by Amy Tikkanen.