Weird rock

MargeShrimpson

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Joined
Apr 2, 2017
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54
Location
Mid/Southern MI
It's super light it floats and is non magnetic. I've never found anything like this before. Maybe a hot rock?
 

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Could be slag from smelting ore as well, kind of hard from the picture but does is it black and appear to be full of bubble holes? Used to find that stuff all over the UP from when they smelted copper. Alot of it would be very light and float.
 
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