tuff
Sign in to savethumb|Cliff face of welded tuff pockmarked with holes — some natural, some man-made — from Bandelier National Monument, [[New Mexico]] thumb|Etruscan architecture|Etruscan tuff blocks from a tomb at [[Banditaccia, Italy]] thumb|upright|A house constructed of tuff blocks in Rieden, Rhineland-Palatinate, in the [[Volcanic Eifel region, Germany]]
AI overview
Tuff is a type of rock formed from volcanic ash that has been compacted and sometimes fused together by heat. It has been used historically as a building material, as seen in structures ranging from Etruscan tombs to houses in volcanic regions like Germany and the American Southwest.
AI-generated from the Wikipedia summary — may contain errors.
Key facts
- Rock.name
- Tuff
- Rock.type
- Igneous
- Rock.image
- Guadalupe Tuff.jpg
- Rock.caption
- Tuff from the Guadalupe Formation in Luzon, Philippines
- Rock.composition
- Volcanic ash
- Rock.composition_secondary
- Quartz, feldspars (sanidine, anorthoclase, plagioclase), biotite, pyroxene (augite), hornblende, and magnetite
- Rock.class
- Mafic to felsic
- Rock.texture
- Pyroclastic or Eutaxitic
via Wikipedia infobox
Article
22 sectionsContents
- Volcanic ash
- Transport and lithification
- Occurrences
- High-silica volcanism
- Alkaline volcanism
- Intermediate volcanism
- Mafic volcanism
- Ultramafic volcanism
- Kimberlites
- Komatiites
- Folding and metamorphism
- Importance
- Italy
- Germany
- United States
- Rapa Nui
- Armenia
- Tephrochronology
- Etymology
- See also
- References
- External links
thumb|Cliff face of welded tuff pockmarked with holes — some natural, some man-made — from Bandelier National Monument, [[New Mexico]] thumb|Etruscan architecture|Etruscan tuff blocks from a tomb at [[Banditaccia, Italy]] thumb|upright|A house constructed of tuff blocks in Rieden, Rhineland-Palatinate, in the [[Volcanic Eifel region, Germany]]
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% 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 or volcanic blocks is called tuff breccia. Tuff composed of sandy volcanic material can be referred to as volcanic sandstone.