Definition
Rhyolite is a fine-grained igneous rock which is rich in silica
Taconite is a low-grade iron ore which belongs to sedimentary rock and containing about 27% iron and 51% silica
History
Origin
North America
Western Australia, Minnesota
Discoverer
Ferdinand von Richthofen
Newton Horace Winchell
Etymology
From German Rhyolit, from Greek rhuax lava stream + lithos stone
From the name of Taconic Mountains in New England
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
-
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock