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Tuff is a type of rock made of volcanic ash ejected from a vent during a [volcanic eruption]. Following ejection and [deposition], the ash is lithified into a solid rock. Rock that contains greater than 75% ash is [considered] tuff, while rock containing 25% to 75% ash is described as tuffaceous (for example, tuffaceous sandstone). A pyroclastic rock containing 25–75% volcanic bombs and/or volcanic blocks is called tuff breccia. Tuff composed of sandy volcanic material can be referred to as volcanic sandstone
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