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Claude Grandpey sent a piece of Obsidian from the Big Obsidian Flow of Newberry Vocano in Oregon which he collected 2010.
A piece of the rock had to be smashed off and crunches with a hammer in order to be able to place it under the microscopes.
SEM Images
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More info: On Newberry volcano: Wikipedia, GVP summary
on Obsidian: Wikipedia
