Definition
Larvikite is an igneous rock and a variety of monzonite, notable for the presence of thumbnail-sized crystals of feldspar
Rhyolite is a fine-grained igneous rock which is rich in silica
History
Origin
Larvik, Norway
North America
Discoverer
Unknown
Ferdinand von Richthofen
Etymology
From the town of Larvik in Norway, where this type of igneous rock is found
From German Rhyolit, from Greek rhuax lava stream + lithos stone
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
Volcanic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock