Stalactites

Stalactites are icicle shaped mineral
deposits that hang from cave ceilings, hot springs or man-made structures like bridges formed over hundreds or thousands of years by dripping water.  Primarily composed of calcium carbonate (limestone) they develop as mineral rich water evaporates leaving behind deposits. 

Water seeps through cracks, dissolving limestone.  Upon reaching the cave ceiling, it drips, leaving behind tiny mineral fragments that build up over time. 

While limestone is most common, they can be made of lava, mud, peat, pitch, sand or even crystalised rat urine.  Their growth is extremely slow, typically relying on steady, slow drip rates. 

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