Green/Blue/Purple, shiny, porous rock. Can’t find on google.

[Japars]

Hi again! I can’t seem to find the identity of these rocks, found on Lake Superior. There were quite a few of them, they shine colors when held to light. Most were green, one is bluish and one is purple. Thanks for looking.

 

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[Charlie P. (NY)]

Welcome!

I'm guessing there was a glass factory nearby at some point. Those all look like glass slag (with bubbles).

 

[Japars]

Ok thanks, I was also thinking glass but the bubbles were throwing me off.

 

[Garscale]

Yep that's slag glass and a cool find