Calcium carbonate deposits which form in caves and around hot springs where carbonate-bearing waters are exposed to the air. The water evaporates, leaving a small deposit of calcium carbonate. Travertine is a white or light-coloured crystalline concretionary limestone, usually hard and semicrystalline, deposited from springs and used for building. Concretionary limestone deposited at the mouth of a hot spring. Extensive deposits exist at Tivoli, near Rome.
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