Why this rock is probably not a meteorite:

These are certainly eye-catching stones, but they're probably not meteorites.

The one on the left has holes. Meteorites don't have holes.
 
The one on the right looks like it once was molten and experienced some kind of flow when it was very viscous. That doesn't happen with meteorites. Atmospheric entry happens so fast that only the exterior melts. The melt that forms gets so hot that most of it sloughs off, but the part that remains is very thin and cools to form the fusion crust.
  
What is it?

These two stones were found "on the edge of the East River between the Brooklyn Bridge and the Manhattan Bridge in Brooklyn." I suspect that they are industrial by-products of some kind.
     

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