Definition
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
History
Origin
Egypt
Germany
Discoverer
Unknown
Van Tooren
Etymology
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites
From Greek tephra, ashes from Indo-European base, to burn
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
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock