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.
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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.
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