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From the peanut gallery

From the comment section of Great Lakes Rocks and Minerals

Molly Stevens Wahr local meteorologist Alana Nehring: As far as the pumice stones that washed up on shore, I haven't heard much about that but my *guess* is that's it's not from an active volcano in the middle of Lake Michigan but rather coal slag that's been dumped from the SS Badger. Not to say that they're currently dumping but just like any other rock, it takes a long time for that to break down in to sand. A more likely reason as to why it washed up on shore shortly after the meteotsunami was that the wave must have reached deeper than the average Lake Michigan wave and was strong enough to disturb the rocks and bring them to the surface and finally toward shore.

Alana Nehring calls herself a Multi-Media Meteorologist at WZZM channel 13

Good "guess" Alana.

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Permalink Reply by XLFD on August 22, 2018 at 6:27pm

For those new to this item, this has been around Facebook the last few days. Claims are that lava rock has been washing up ashore along the nearby coast. Here is a link to the video that somebody made: https://www.facebook.com/michael.almas.9/videos/1989304487775731/

I think it's an Urban legend as I haven't seen any sort of verification of the video's assertion. I haven't ran into any real people around the area who have seen pumice floating onshore or on the beach. Slag from foundries, maybe. The video only uses 'textbook pictures' and appears to be made by somebody without a lot of credibility. Fake news.