Why this rock is probably not a meteorite:

1) No fusion crust.  

2) The rock is rounded, but it appears to be from erosion, not ablation during atmospheric entry (no regmaglypts)

3) The shape is a bit too geometrical (trapezoidal, from this angle) for a meteorite. When terrestrial volcanic bodies cool and contract, they sometimes form blocky polygonal fragments.  The rocks of Devil's Tower are a good example.  Meteorite impacts on asteroids or the Moon don't produce rocks with geometric shapes like this. 
What is it?

Probably a diabase.  This rock was found by the finder of the previous rock.  Both had very similar compositions.


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.