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Dwarves' Earth Treasures Online Museum:
Northern Shore of Minnesota

  . Finally, porcelian-like datolite nodules have been found somewhere else besides Michigan and that's a river along the northern shoreline of Minnoseta. It's not surprising since the same Portage Lake Volcanics basalts beds seen in Michigan show up along the shorelines of Minnesota. The datolites found there are white so there's no need to cut any nodules coming from there even it's possible to find a bit of color.

You can click on the pictures to see larger pictures.


Bit of orange colors.
Nodule