A 105-year-old banded pumice clast from the 1912 Novarupta eruption of Katmai in Alaska. #InternationalRockDay http://pic.twitter.com/YTBVUx3DW1
— Bob Gooday (@BobGooday) July 13, 2017
via Twitter https://twitter.com/BobGooday
July 13, 2017 at 09:10PM
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