That looks like a rock to me. I wonder what made the man take it to the lab for examination. I would have kept it as a door stop.
It has some interesting colors in it. I’m glad he found out what it is.
Rocks are cool.
It looks like lava with the little popped bubbles. But unlike pumice, it’s heavy as hell. Probably magnetic as well.
Those are the tell-tale signs. Iron doesn’t get that hot in our world.