Why this rock is probably not a meteorite:

It's not possible to confidently rule out that this rock is a meteorite from the photo.  There's some kind of crust, but it's not as smooth as the fusion crust of meteorites. 
What is it?

It resembles a piece of basalt.


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.