Definition
Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix
A sedimentary rock, deposit of a submarine turbidity currents and are composed of layered particles
Origin
Egypt
European Foreland Basins
Discoverer
Unknown
Arnold H. Bouma
Etymology
From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites
From Medieval Latin turbiditas, from Latin turbidus (turbid). Turbidity current is from 1939
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Opaque Rock