COD. 022TB

From Wikipedia, the free encyclopedia
Tuff (from the Latin "tuphi") is a type of pyroclastic sediment rock of igneous origin, in particular the most common tuff in pyroclastic rocks. Due to their similarities many people believe tuff to be travertine.
Tuffs – treated as different variations of tuff, in their larger part are not formed from lapilis sized between 2 mm and 30 mm expelled during volcano eruption. The term of tuffites designates rocks consisting of igneous detrital material connected with seashells.
As mentioned above, the structure of tuffs is cyneric or glass clastic namely as a result of the type of glass-like portion that is finely subdivided and fragmented.
Lapilis of smaller sizes sometimes may spread on bigger ones, and sometimes such hardening takes place under water influence.
The environment where such lapilis precipitate may be largely various, and together with rock structure, it determines the characteristics of tuff color, structure and texture.
Limestone, formed from sediments precipitated as a result of water influence, form rocks called tuffs, the structure of which usually consist of vestiges of fossilized plants or shells.

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