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