Definition
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
Banded iron formation are distinctive units of sedimentary rock that are almost always of Precambrian age
History
Origin
Italy
Western Australia, Minnesota
Discoverer
Unknown
Johann Gottlob Lehmann
Etymology
From a Latin word tophous then in Italian tufo and finally tuff
From its formation process
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock