Why this rock is probably not a meteorite:

Because there's no fusion crust. Also, the finder said that it was one of 400 lunar meteorites he'd found "hiding in plain site" near his home in Colorado. He said with some assurance that this was a lunar gabbronorite.
What is it?

It looks like some rounded and polished cobble like you could find anywhere in the Rocky Mountains.
More to the story

The finder of this rock directed me to a website where he had photos of many rocks that he identified as lunar and martian meteorites and other rare meteorite types. He eventually sent me 32 rocks to look at. There wasn't anything about any of them that suggested that they were meteorites. I tried to reason with him in a polite manner, but he had already made up his mind. After many e-mail exchanges, he became irrational. "I have given you this potential discovery on a silver platter, but you have chosen to spit in my eye, as if I was some kind of lowly peon. Never, have I been treated with such arrogant malice!" He's never provided any evidence other than his opinion that any of his rocks are meteorites.

Nevertheless, he has attempted to sell several of these rocks on e-bay as rare types of meteorites. One "lunar olivine-pyroxene meteorite" he was willing to relinquish for $636,000.


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.