Definition
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix
Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine
History
Origin
Egypt
New Zealand
Discoverer
Unknown
Ferdinand von Hochstetter
Etymology
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites
From the name of Dun Mountain, New Zealand, + -ite1
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock