Definition
Shonkinite is a rare, dark-coloured and intrusive igneous rock which contains augite and orthoclase feldspar as its primary constituents
Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar
History
Origin
USA
France
Discoverer
Unknown
Alexandre Brongniart
Etymology
From the name of Shonkin Sag ranges in the Highwood Mountains of north-central Montana, US
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, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
-
-
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock