Everything about Stalactite totally explained
A
stalactite (
Greek stalaktites, (Σταλακτίτης), from the word for "drip" and meaning "that which drips") is a type of
speleothem (secondary mineral) that hangs from the ceiling or wall of
limestone caves. It is sometimes referred to as
dripstone.
Formation
Stalactites are formed by the deposition of
calcium carbonate and other minerals, which is precipitated from mineralized water
solutions. The corresponding formation on the floor underneath a stalactite is known as a
stalagmite. Given enough time, these formations can meet and fuse to create
columns.
Every stalactite begins with a single mineral-laden drop of water. When the drop falls, it leaves behind the thinnest ring of calcite. Each subsequent drop that forms and falls deposits another calcite ring. Eventually, these rings form a very narrow (0.5 mm), hollow tube commonly known as a "
soda straw" stalactite. Soda straws can grow quite long, but are very fragile. If they become plugged by debris, water begins flowing over the outside, depositing more calcite and creating the more familiar cone-shaped stalactite.
The same water drops that fall from the tip of a stalactite deposit more calcite on the floor below, eventually resulting in a rounded or cone-shaped stalagmite. Unlike stalactites, stalagmites never start out as hollow "soda straws."
While it has been claimed that the longest stalactite known hangs in the Chamber of Rarities in the
Gruta Rei do Mato (
Sete Lagoas,
Minas Gerais,
Brazil) and is 20 metres long, vertical
cavers have often encountered longer stalactites while exploring. The longest stalactite viewable by the general public is in Doolin Cave,
County Clare,
Ireland, in a
karst region known as
The Burren.
Stalactites can also form on concrete ceilings, and on plumbing where there's a slow leak and limestone (or other minerals) is in the water supply, although they form much more rapidly there than in the natural cave environment (description and experiments see literature). Stalactites can also form in
lava tubes, although the mechanism of formation is much different. A common growth rate is 1 millimeter a year.
Further Information
Get more info on 'Stalactite'.
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