👉 A stalagmite is a type of stalactite or crystal that forms in the rock above a cave. It is an irregular, irregularly shaped mineral that can be found in various shapes and sizes. The structure of a stalagmite is formed by the accumulation of minerals, such as quartz, on top of the base of the stalactite. As the stalactite grows over time, it may become more dense and harder, which eventually breaks off into smaller pieces called "stal