Why this rock is probably not a meteorite:

We are unaware of any meteorite with this kind of nonaerodynamic shape and reddish color.
What is it?

This is probably a nodule of marcasite or possibly pyrite that is highly corroded. Marcasite forms in limestones. On exposure to air, it decomposes and forms a brown-red iron oxide coating.

Thanks to Jolyon Ralph of www.mindat.org for identifying this one.


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.