Light pumice ; Juvenile pumice on surface of the 2017-2018 tuff ring; White glassy pumice (80% vesicularity) with 2% rounded mafic grains to 4 mm, 20% plagioclase to 3 mm. 3-4 mm slightly vesicular (10%) dark gray rind (probably coated in scoria composit
Petrology of the 2016-2017 eruption of Bogoslof Island, Alaska
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