sample rhyolite silicic volcanic rock stone geologist hand

navigate by keyword : attach black carbon charcoal close coal color crystal difficult extrusive fuel geologist geology gold grains gray hand high igneous macro mineral natural nature object observe ore paving pink precious pyrite rail raw rhyolite rock sample shiny silica silicic sleepers small stone stones texture used volcanic white

   
   
   
   
   
   
   
Sample of Rhyolite silicic volcanic rock stone on Geologist's hand.
   
   
   
   
   
   
   
Rhyolite is an extrusive igneous rock with a very high silica content. It is usually pink or gray in color with grains so small that they are difficult to observe without a hand lens. The paving stones are used to attach the rail to the rail sleepers.

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