Why this rock is probably not a meteorite:

There's no fusion crust.

It's metallic (sawn face, bottom photo) and it's also magnetic, so it's probably composed mainly of iron. It's got many big holes (gas bubbles) in it. There are crystals growing in the holes. We've never seen an iron meteorite with these features.

What is it?

This thing was brought to us by someone who found it in his backyard here in the Saint Louis area.  We think it's yet another piece of slag.


Prepared by:

Randy L. Korotev

Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you’ve found until you read this and this.