Tuff
Photographed by Michael P. Klimetz

Welded Tuff

MEXICO
Tuff is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. Welded tuff is a pyroclastic rock, of any origin, that was sufficiently hot at the time of deposition to weld together. Strictly speaking, if the rock contains scattered pea-sized fragments [or fiamme], it is called a welded lapilli-tuff. Welded tuffs (and welded lapilli-tuffs) can be of fallout origin, or deposited from pyroclastic density currents, as in the case of ignimbrites. During welding, volcanic glass shards and pumice fragments adhere together (necking at point contacts), deform, and compact together, resulting in a characteristically eutaxitic fabric.
Photographed by Michael P. Klimetz


MEXICO
Photographed by Michael P. Klimetz

Welded Vitric Rhyolitic Tuff
(Wonderstone)

UTAH
Photographed by Michael P. Klimetz

[Welded Tuff]

Zacatecas

MEXICO
Photographed by Michael P. Klimetz

Welded Trachytic Tuff

Mount Kenya

KENYA
Photographed by Michael P. Klimetz

Welded Vitric Rhyolitic Tuff
(Wonderstone)

Cretaceous-Eocene
Vernon Hills

Tooele County
UTAH
Photographed by Michael P. Klimetz

Welded Vitric Rhyolitic Tuff
(Wonderstone)

Cretaceous-Eocene
Vernon Hills

Tooele County
UTAH
Photographed by Michael P. Klimetz

Welded Vitric Rhyolitic Tuff
(Wonderstone)

Cretaceous-Eocene
Vernon Hills

Tooele County
UTAH
Photographed by Michael P. Klimetz

Trachytic Tuff
(Sanidine Pyroclasts)

Drachenfels
Koenigswinter
Siebengebirge

North Rhine-Westphalia
GERMANY
Photographed by Michael P. Klimetz

Trachytic Pumaceous Tuff
(Black and Dark Brown Kaersutite Pyroclasts)

Pleistocene

Wannenkoepfe

Eifel
GERMANY
Photographed by Michael P. Klimetz

Trachytic Pumaceous Tuff
(Black and Dark Brown Kaersutite Pyroclasts)

Pleistocene

Wannenkoepfe

Eifel
GERMANY
Photographed by Michael P. Klimetz

Trachytic Pumaceous Tuff
(Black and Dark Brown Kaersutite Pyroclasts)

Pleistocene

Wannenkoepfe

Eifel
GERMANY
Photographed by Michael P. Klimetz

Trachytic Pumaceous Tuff
(Black and Dark Brown Kaersutite Pyroclasts)

Pleistocene

Wannenkoepfe

Eifel
GERMANY