Rhyolite Rock


Rhyolite rock is quite rare. 

It is an extrusive igneous rock, which is formed when extremely explosive volcanoes erupt.





Its lava is so viscous, sticky and so much lacks volatiles, that it piles up and builds lava domes instead of flowing away when it does reach ground.

It often has a porphyritic texture, with phenocrysts (large crystals) that formed underground, in intrusive conditions, and a fine-grained matrix that formed from lava once the volcano had erupted.

 rhyolite rock

 Rhylote rock by Jesús Rodríguez Fernández via Flickr.com

It can also have a banded texture which lacks phenocrysts.

Common minerals are quartz, feldspar, pyroxene, amphibole and biotite.

If a magma with the same composition would be formed completely underground, this rock would be granite
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