stalactite

noun

1. A secondary mineral deposit of calcium carbonate or another mineral, in shapes similar to icicles, that hangs from the roof of a cave.

   “In one place, near at hand, a stalagmite had been slowly growing up from the ground for ages, builded by the water-drip from a stalactite overhead.”

   “There is the Hang Ken cave with its waterfalls spilling into large lagoons, shimmering goldlike mineral deposits and soaring columns created over thousands of years when stalactites hanging from the cave roof met stalagmite formations building from the cave floor.”