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| Rhyolite |
Rhyolite is an igneous, volcanic, rock which is silica
rich. It is designated extrusive because
it is the product of magma exiting a volcano either in a flow or explosion. My thoughts are that this sample came from a
flow because it does not show bubbles.
Rhyolite eruptions are not common.
Only three have been recorded, world wide, since the beginning of the
20th Century. This sample was originally
obtained in either New Mexico or Nevada.
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| Rhyolite |
I can see where it flowed around some sort of crystal before it cooled.
This type of lava cools quickly in the open air. The quick cooling precludes the formation of large crystals. The closer I look, I can see small crystalizaion.
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| Rhyolite |
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| Rhyolite |
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