New Members Neal Posted September 30, 2019 New Members 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!!
caldigger Posted September 30, 2019 Posted September 30, 2019 I would bet this is slag from a refinery.
Rockwood Posted September 30, 2019 Posted September 30, 2019 Slag alright. Locomotive boilers made a fair amount of it too.
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