trav·er·tine (noun)
1. A light-colored porous calcite, CaCO3, deposited from solution in ground or surface waters and forming, among other deposits, stalactites and stalagmites.
2. A compact calcium carbonate used as a facing material in construction.
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1. A light-colored porous calcite, CaCO3, deposited from solution in ground or surface waters and forming, among other deposits, stalactites and stalagmites.
2. A compact calcium carbonate used as a facing material in construction.
;-)