Definition
Breccia is a rock consisting of angular fragments of stones which are cemented by finer calcareous material
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
History
Origin
England
Italy
Discoverer
Unknown
Unknown
Etymology
From Italian, literally gravel, Germanic origin and related to break
From a Latin word tophous then in Italian tufo and finally tuff
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock