Definition
Larvikite is an igneous rock and a variety of monzonite, notable for the presence of thumbnail-sized crystals of feldspar
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
Larvik, Norway
Pennines, England
Discoverer
Unknown
J.J. Ferber
Etymology
From the town of Larvik in Norway, where this type of igneous rock is found
From Grit + Stone
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