Definition
Rhyolite is a fine-grained igneous rock which is rich in silica
Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle
History
Origin
North America
Pike County, U.S
Discoverer
Ferdinand von Richthofen
Unknown
Etymology
From German Rhyolit, from Greek rhuax lava stream + lithos stone
From French, from peridot + -ite
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Plutonic
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock