Why this rock is probably not a meteorite:

It's too spherical; meteorites aren't spherical. Also, in the bottom photo, there's something square inside.
What is it?

This is neat. This thing started out as a cubic crystal (or 2 crystals) of pyrite. It oxidized, converting to a an iron oxide, probably hematite. There are some more examples on our concretions page.


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.