Tuff and volcanic breccia are both composed of a variety of igneous rock fragments. Their classification as either felsic, intermediate, or mafic therefore depends on the mineral content of each individual unit.
Tuff and volcanic breccia are classifies as types of rocks that are formed form ash residues of volcanic eruption and other small-sized particles.
These rock have a pyroclastic texture and their fragment size is less than 2.5 inches, hence, called tuff.
On the other hand, volcanic breccia have larger rock fragments having size more than 2.5 inches.
Their chemical composition shows that they are made up of mineral rich igneous rocks i.e. felsic or intermediate and also contain volcanic explosive materials.
Furthermore, tuff is also called volcanic tuff as it is formed from ash particles and volcanic material.
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