Stalactite
Elongated mineral formation hanging down from a cave ceiling / From Wikipedia, the free encyclopedia
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A stalactite (UK: /ˈstæləkˌtaɪt/, US: /stəˈlæktaɪt/; from Ancient Greek σταλακτός (stalaktós) 'dripping', from σταλάσσειν (stalássein) 'to drip')[1] is a mineral formation that hangs from the ceiling of caves, hot springs, or man-made structures such as bridges and mines. Any material that is soluble and that can be deposited as a colloid, or is in suspension, or is capable of being melted, may form a stalactite. Stalactites may be composed of lava, minerals, mud, peat, pitch, sand, sinter, and amberat (crystallized urine of pack rats).[2][3] A stalactite is not necessarily a speleothem, though speleothems are the most common form of stalactite because of the abundance of limestone caves.[2][4]
The corresponding formation on the floor of the cave is known as a stalagmite.