Stalactite
A stalactite is a form that can be found on the ceiling of a cave. When a drop of water flows down the stalactite, the water evaporates and leaves a mineral deposit of calcite. This slowly increases the length and thickness of the stalactite.
The corresponding formation on the floor underneath a stalactite is known as a stalagmite. Given enough time, these formations can meet. The results are known as columns.
Stalactite Media
Image showing the six most common speleothems with labels. Enlarge to view labels.
Demonstration of drip stone formation in a lab. The blue color is due to the addition of cupric ions (Cu2+) to the mother solution.
Pillars in the Caves of Nerja, Spain
Shark tooth stalactites in a lava tube on the Big Island of Hawaii. This shows clearly how a flow of lava rose to coat another layer on to pre-existing stalactites.
Ice stalactites on the gutter of a house
Ice stalactites on a frozen beach in Bete Grise, Michigan
Concrete stalactites photographed at the Mostar interchange.
Calthemite soda straw stalactites under a concrete slab
