Stalactites and stalagmites
Siever, Raymond Formerly, Department of Geology, Harvard University, Cambridge, Massachusetts.
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Stalactites, stalagmites, dripstone, and flowstone are travertine deposits in limestone caverns (see illustration), formed by the evaporation of waters bearing calcium carbonate. Stalactites grow down from the roofs of caves and tend to be long and thin, with hollow cores. The water moves down the core and precipitates at the bottom, slowly extending the length while keeping the core open for more water to move down. Stalactites are banded concentrically to the center.
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