Definition
Rhyolite is a fine-grained igneous rock which is rich in silica
Oolite is a sedimentary rock formed from ooids, spherical grains which are composed of concentric layers of calcite
History
Origin
North America
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Discoverer
Ferdinand von Richthofen
William Smith
Etymology
From German Rhyolit, from Greek rhuax lava stream + lithos stone
From oo- + -lite, after German Oolit. A rock consisting of fine grains of carbonate of lime
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock