Why this rock is probably not a meteorite:

The orange thing on the left is clearly not a meteorite. The thing on the right probably isn't either. Meteorites, particularly ones as big as this, are never this spherical. Also, only a handful of meteorites have been found embedded in other rocks. Such meteorites are known cases of "fossil meteorites." Also, there were at least two other spheres, now gone, embeded in the cast, and different stones of a meteorite wouldn't be found so close together.
  
What is it?

This handsome what-ever-it-is was found in Idaho. We're a bit stumped because we've only seen these photos. Almost certainly, it's some kind of concretion. What's puzzling is that the gray rock looks basaltic, but concretions only occur in sedimentary rocks, not igneous rocks.

Please contact me if you know what this is. This is one of the neatest meteorwrong photos I've ever been sent.

Addendum: Thanks to Maurizio for pointing out that this looks a lot like onion-skin weathering.
  


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