Neal Posted September 30, 2019 Share Posted September 30, 2019 Hi, My name is Neal, I found this rock on the side of a railroad bed near Caro, MI. It is heavy for it's size, and has quite a bit of porosity to it. Any help would be appreciated. Thanks!! Link to comment Share on other sites More sharing options...
caldigger Posted September 30, 2019 Share Posted September 30, 2019 I would bet this is slag from a refinery. Link to comment Share on other sites More sharing options...
Rockwood Posted September 30, 2019 Share Posted September 30, 2019 Slag alright. Locomotive boilers made a fair amount of it too. Link to comment Share on other sites More sharing options...
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