Definition
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar
History
Origin
Germany
France
Discoverer
Christian Leopold von Buch
Alexandre Brongniart
Etymology
From Latin glaber bare, smooth, bald
From Auvergne region of France used by a French geologist Alexandre Brongniart in 1826 who applied this term to some feldspathic sandstones
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
-
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock