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