Backscatter Electron Image (BSE) of tephra erupted from the 2018 Veniaminof eruption and collected in a snow pit adjacent to the new lava flow field. The sample's position within the snow suggests it erupted in mid-November. The top and bottom images show a close-up view of the groundmass texture, which is a mix of glass and microlite crystals of plagioclase (dark gray), olivine (light gray) and clinopyroxene (medium gray). The size, number, and proportion of microlites and crystal-free glass can help understand the dynamics of the eruption. Image taken with a JEOL 6510LV Scanning Electron Microscope.
Image courtesy of AVO/USGS.
Please cite the photographer and the Alaska Volcano Observatory / U.S. Geological Survey when using this image.
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