When discussing mineral formations in caves, we often talk about stalactites and stalagmites. A stalactite is an icicle-shaped formation that hangs from the ceiling of a cave, and is produced by precipitation of minerals from water dripping through the cave ceiling. Most stalactites have pointed tips. A stalagmite is an upward-growing mound of mineral deposits that have precipitated from water dripping onto the floor of a cave. Most stalagmites have rounded or flattened tips. There are many other types of mineral formations found in caves. For example, flowstones are deposits of minerals from water flowing over the floor or walls of a cave. As layers of flowstone become thicker, their shape becomes rounded. Well-defined crystals growing underwater in cave pools are known as pool spar.

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