Why this rock is probably not a meteorite:

I received this photo with no information other than an e-mail subject line that read "possible luner rock." A month later I received a chemical analysis. In the photo, it resembles a lunar breccia, but the chemical analysis showed it to be of terrestrial origin.
What is it?

Probably a volcaniclastic rock. I might be able to make a better guess if the sender had mentioned where he found it.  


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.