That's a sick curio collection

I'm not a geologist so I've got no stake here but I'm wondering if one could make an argument that there isn't really much of a difference between metal slag and a rock

I was just joking about this rock looking like a pigeon. But apparently pigeonite is a real thing? TIL

You’re totally right, it looks like those photos of Hawaii’s volcanic floes

There was a much larger chunk that probably weighed 100 lbs on the rails that was all bubbly and lumpy, like cooled magma.