Incredible banded obsidian and rhyolite from Chaitén #volcano. Any petrologists want to explain? #rocksrock #eruption #lava http://pic.twitter.com/49rgcyZpKx
— Geoff Lerner (@Tyranakisaurus) November 18, 2016
via Twitter https://twitter.com/Tyranakisaurus
November 19, 2016 at 04:39AM
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