_:b1217886 . _:b1217886 . _:b1217886 "A natural chemical precipitate of carbonate minerals; typically aragonite, but often recrystallized to or primarily calcite; which is deposited from the water of mineral springs (especially hot springs) or streams saturated with calcium carbonate."^^ . _:b1217886 . _:b1217886 "Wikipedia:Travertine"^^ .