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Claude Grandpey sent a piece of pumice from the Valley of the 10000 smokes which was created by Novarupta, Katmai region Alaska. He collected it 2009.
Wikipedia: Valley of the 10000 smokes
A piece of the rock had to be smashed off and crunched with a hammer in order to be able to place it under the microscopes.
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More Info:
Wikipedia Valley of the 10000 smokes GVP Novarupta sources, GVP Novarupta Summary, GVP Katmai sources, GVP Summary,
post on this Katmai: A Blast from Hell
