Definition
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
Granulite is fine to medium grained metamorphic rock with a granular of polygonal crystals.
History
Origin
Italy
Central Europe
Discoverer
Unknown
Unknown
Etymology
From a Latin word tophous then in Italian tufo and finally tuff
From Latin granulum, a little grain or fine grained
Class
Igneous Rocks
Metamorphic 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, Medium Grained Rock, Opaque Rock