Definition
Rhyolite is a fine-grained igneous rock which is rich in silica
An iron rich extrusive rock found as a member of the alkali basalt magma series
History
Origin
North America
Isle of Mull, Scotland
Discoverer
Ferdinand von Richthofen
Ben More
Etymology
From German Rhyolit, from Greek rhuax lava stream + lithos stone
From the name of discoverer, Ben More
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock