Definition
Rhyolite is a fine-grained igneous rock which is rich in silica
Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin
History
Origin
North America
USA, Australia
Discoverer
Ferdinand von Richthofen
Tornebohm
Etymology
From German Rhyolit, from Greek rhuax lava stream + lithos stone
From an old Swedish mining term originally used to describe a type of silicate gangue or waste rock.
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
-
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock