Definition
Charnockite is a variety of granite containing minerals like orthopyroxene, quartz, and feldspar
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
History
Origin
Tamil Nadu, India
Italy
Discoverer
T. H. Holland
Unknown
Etymology
From Job Charnock, an administtrator of East India Company
From a Latin word tophous then in Italian tufo and finally tuff
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock