Definition
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
Italy
Pennines, England
Discoverer
Unknown
J.J. Ferber
Etymology
From a Latin word tophous then in Italian tufo and finally tuff
From Grit + Stone
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock