Definition
Rhyolite is a fine-grained igneous rock which is rich in silica
Blueschist is a metamorphic rock which is generally blue in color and is formed under conditions of high pressure and low temperature
History
Origin
North America
USA
Discoverer
Ferdinand von Richthofen
Edgar Bailey
Etymology
From German Rhyolit, from Greek rhuax lava stream + lithos stone
From French schiste, Greek skhistos i.e. split
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
-
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock