Tuff
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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 lithifies into solid rock. Rock that contains greater than 75% as
Tuff from the Guadalupe Formation in Luzon, Philippines
Cliff face of welded tuff pockmarked with holes — some natural, some man-made — from Bandelier National Monument, New Mexico
Etruscan tuff blocks from a tomb at Banditaccia, Italy
A house constructed of tuff blocks in Rieden, Rhineland-Palatinate, in the Volcanic Eifel region, Germany
Ignimbrite
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Ignimbrite is a type of volcanic rock, consisting of a typically welded tuff. Ignimbrites form from the deposits of pyroclastic flows, which are a hot suspension of particles and gases flowing rapidly
Tuff
…it is called a welded lapilli tuff. Welded tuffs (and welded lapilli tuffs) can be of fallout origin, or deposited from ash flows, as in the case of ignimbrites. During welding, the glass shards and pumice fragments adhere together (necking at point contacts), deform, and compact together, resulting in a eutaxitic…
Ignimbrite from Java, Indonesia
The caprock in this photo is the ignimbrite layer of the Rattlesnake Formation in Oregon.
Rheomorphic flow structures in a welded ignimbrite, Isle of Lipari, Italy
A block of ignimbrite