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Tuff (from Italian tufo) is a type of rock produced by the eruption of volcanoes.
It consists of consolidated [1] volcanic ash ejected from vents during a volcanic eruption. Rock with more than 50% tuff is called tuffaceous. The chemical and mineral composition of tuff varies according to what was in the molten magma.
- ↑ By 'consolidated' is meant: the volcanic ash has been turned into a rock over time, by various geological processes.