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Rhyolite and Variolite Definition


Definition

Definition
Variolites are a group of dark green basic igneous rocks which exhibit pale colored spots, or spherules, especially on weathered surfaces, that give them a pockmarked appearance   
Rhyolite is a fine-grained igneous rock which is rich in silica   

History
  
  

Origin
France   
North America   

Discoverer
Unknown   
Ferdinand von Richthofen   

Etymology
From Latin varius, speckled, variegated   
From German Rhyolit, from Greek rhuax lava stream + lithos stone   

Class
Igneous Rocks   
Igneous Rocks   

Sub-Class
Durable Rock, Hard Rock   
Durable Rock, Hard Rock   

Family
  
  

Group
Volcanic   
Volcanic   

Other Categories
Opaque Rock   
Coarse Grained Rock, Opaque Rock   

Texture >>
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