Left:Demonstration of drip stone formation in a lab.
Carlsbad Caverns National Park, New mexico
Stalactite is a type of formation that hangs from the ceiling of caves, hot springs, or man made structures (bridges and mine). Stalactites can be composed of many different materials such as lava, minerals, mud, water, sand etc. When a stalactite meets the floor it is called stalagmite.
Any material, which can dissolve, hanged in suspension is capable being formed as a stalactite. I found this phenomenon very interesting since it is very common and demonstrates a movement and I also think one could experiment with it further on.