Rhyolite |
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RhyoliteExtrusive igneous rock of felsic composition.This sample is very fine-grained, formed from rapidly cooling lava, void of gases (hense no bubbles). The fine texture allows it to have a concoidal fracture. Colorado River terrace deposit near Lake Havasu City, Arizona. |
| https://gotbooks.miracosta.edu/rocks/igneous/26.html | 2/2/2021 |