Definition
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix
Icelandite belongs to volcanic igneous rocks which is rich in iron and belongs to andesite rock
History
Origin
Egypt
Iceland
Discoverer
Unknown
Ian S. E. Carmichael
Etymology
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites
From its origin place near Cenozoic volcano near the parsonage Þingmúli in East Iceland
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock