The cone-shaped dripstone deposits found on the floor of caves are called stalagmites.

Here's a breakdown:

* Stalactites hang from the ceiling of a cave, like icicles. They are formed by dripping water that leaves behind mineral deposits as it evaporates.

* Stalagmites rise from the floor of a cave, often directly below a stalactite. They are also formed by dripping water, but the deposits build up on the floor instead of the ceiling.

Over time, stalactites and stalagmites can grow to impressive sizes and form unique formations.