Definition
Rhyolite is a fine-grained igneous rock which is rich in silica
Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature
History
Origin
North America
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Discoverer
Ferdinand von Richthofen
René Just Haüy
Etymology
From German Rhyolit, from Greek rhuax lava stream + lithos stone
From French, Greek eklogē selection with reference to the selective content of the rock + -ite1
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