Definition
Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava
Rhyolite is a fine-grained igneous rock which is rich in silica
History
Origin
North America
North America
Discoverer
Theodor von Gümbel
Ferdinand von Richthofen
Etymology
From Andes mountains, where it is found in abundance
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
Volcanic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock