- Stalagmites may also refer to a type of fungus.
A stalagmite is a form that can be found on the floor of a cave. It rises from the floor of a limestone cave when mineralized solutions drip from the ceiling and deposits of calcium carbonate form columns on the ground. The corresponding formation on the ceiling of a cave is known as a stalactite.
There are several methods to help remember which formation hangs from the ceiling (stalactite) and which rises from the floor (stalagmite):
- StalaCtite has a "c" for "ceiling".
- StalaGmite has a "g" for "ground".
- The T in StalacTite resembles one hanging from the ceiling, while the M in StalagMite resembles a formation rising from the floor.
When touring caves with stalactites and stalagmites you might be asked to not touch the rock formations. This is generally because the formation is considered to still be growing and forming. Since the rock buildup is formed by minerals solidifying out of the water solution, skin oils can disturb where the mineral water will cling. So the development of the rock formation will be affected and not natural anymore.
Stalactites and stalagmites can also form on concrete ceilings and floors, but they form much more rapidly there than in the natural cave environment.
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- from the Greek stalagma ("Σταλαγμίτης"), "drop" or "drip"