Why this rock is probably not a meteorite:

It is a meteorite. Notice that the dark fusion crust is broken away in many places. The interior of the stone is lighter than the fusion crust; this is the normal for meteorites. Where there is fusion crust, the crust is smooth. There are a few regmaglypts visible in the fusion crust.
  
What is it?

This is one of the Park Forest (Illinois) stones.

See Simon et al. (2004) The fall, recovery, and classification of the Park Forest meteorite. Meteoritics and Planetary Science, vol. 39, no. 4, p. 625-634.
   

www.catchafallingstar.com
www.catchafallingstar.com


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.

e-mailkorotev@wustl.edu