Definition
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix
Charnockite is a variety of granite containing minerals like orthopyroxene, quartz, and feldspar
History
Origin
Egypt
Tamil Nadu, India
Discoverer
Unknown
T. H. Holland
Etymology
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites
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