Definition
Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar
Diabase is a fine-grained igneous rock which is composed mostly of pyroxene and feldspar
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 Greek di + base
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock