Definition
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
History
Origin
Italy
Pike County, U.S
Discoverer
Unknown
Unknown
Etymology
From a Latin word tophous then in Italian tufo and finally tuff
From the chemical and mineralogical composition of the upper mantle of the Earth
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock