Definition
Phonolite is an uncommon extrusive igneous rock volcanic rock of intermediate chemical composition between felsic and mafic
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
History
Origin
-
Germany
Discoverer
Unknown
Christian Leopold von Buch
Etymology
From the Greek meaning sounding stone because of the metallic sound it produces if an unfractured plate is hit
From Latin glaber bare, smooth, bald
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
-
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock