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A white concretionary form of calcium carbonate, usually hard and semicrystalline. It is deposited from the water of springs or streams holding lime in solution. Extensive deposits exist at Tivoli, near Rome.

A white concretionary form of calcium carbonate, usually hard and semicrystalline. It is deposited from the water of springs or streams holding lime in solution. Extensive deposits exist at Tivoli, near Rome.

(Geol.) A white calcareous rock, deposited from water holding lime in solution ; e.g. that of the Anio at Tibur ; Travertinus lapis, i.e. Tiburtinus, stone of Tibur, Tivoli.

n. [French] A white concretionary limestone, hard and crystalline, deposited from water that holds lime in solution.