Travertine is a calcareous rock, of chemical origin, typical of central Italy, among the oldest used in the building world. Particularly famous is the one found near Rome in the area of the Aniene valley between Tivoli and Guidonia.

Lapis tiburtinus – stone from Tivoli – was formed by precipitation of calcium carbonate from water of karstic origin, has good qualities of hardness and mechanical resistance.

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