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n. A light-colored porous calcite, CaCO3, deposited from solution in ground or surface waters and forming, among other deposits, stalactites and stalagmites.

n. A compact calcium carbonate used as a facing material in construction.

n. Any of several light, porous forms of calcite deposited from solution; found most often as stalactites and stalagmites.

n. A similar form of limestone used as a facing material in building.

n. 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.

"The area around the pool becomes a sunken courtyard paved in travertine with steps and walls of stone."

freestone    dolomite    kaolin    pumice    magnesian