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Igneous rock: Obsidian mahogany
A stalactite is a dripstone formation at the ceiling of a cave. It is a karst phenomenon. Because calcareous drops of groundwater seep into a cave, these drops loose their dissolved carbon dioxide (Co2) and the dissolved calcium (Ca) is precipitated in the cave. At the ceiling of the cave stalactites occur, the drops that fall down further will form a stalagmite. Ultimately, stalactite and stalagmite grow together and creates a column.
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