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