Definition
Larvikite is an igneous rock and a variety of monzonite, notable for the presence of thumbnail-sized crystals of feldspar
Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar
History
Origin
Larvik, Norway
France
Discoverer
Unknown
Alexandre Brongniart
Etymology
From the town of Larvik in Norway, where this type of igneous rock is found
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, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock