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 3.75" x 3.5"
A seismometer got away from people on a ship trying to implant it into the seafloor--the search for it brought up a small amount of mud that a physicist passed to me. It's the dark brown exterior glaze (heavily speckled with metallic-looking eruptions). Interior and exterior copper green are glazes assembled from refined materials.

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 5.75" x 3.5"
Monterey Bay is the brown sediment on the exterior. Matte white and green glaze assembled from refined materials.

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