Definition
Rhyolite is a fine-grained igneous rock which is rich in silica
Cataclasite is a type of cataclastic rock that is formed by fracturing and comminution during faulting. It is normally cohesive and non-foliated, consisting of angular clasts in a finer-grained matrix
History
Origin
North America
Swiss Alps, Europe
Discoverer
Ferdinand von Richthofen
Michael Tellinger
Etymology
From German Rhyolit, from Greek rhuax lava stream + lithos stone
From the Italian word cataclasi
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
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Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock