Definition
Charnockite is a variety of granite containing minerals like orthopyroxene, quartz, and feldspar
Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock
History
Origin
Tamil Nadu, India
USA
Discoverer
T. H. Holland
Unknown
Etymology
From Job Charnock, an administtrator of East India Company
From the locality in Essex County, Massachusetts,US
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
Plutonic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock