* Stalactites hang down from the ceiling of a cave. They are formed by mineral-rich water dripping from the ceiling. As the water evaporates, it leaves behind minerals that build up over time, creating the iconic icicle-like formations.
* Stalagmites grow up from the floor of a cave. They are formed by the drips from stalactites falling to the ground and depositing minerals.
So, while stalactites do form from mineral deposits over time, they grow from the ceiling, not the floor.
