Definition
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix
An iron rich extrusive rock found as a member of the alkali basalt magma series
History
Origin
Egypt
Isle of Mull, Scotland
Discoverer
Unknown
Ben More
Etymology
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites
From the name of discoverer, Ben More
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock