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Travertine is a chemical sedimentary rock that is formed when calcite precipitates out of water and is deposited in layers. It is often seen in wet caves, forming a semi-translucent, pink-orange rock with a "flowing" appearance. When water runs through the limestone caves, it dissolves calcite. Later on, tiny amounts of the calcite are deposited when, for example, the water drips from the ceiling of the cave, forming stalactites and stalagmites.

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15y ago

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