Why this rock is probably not a meteorite:
This rock was found embedded in a slab of limestone by someone who
cuts limestone for a living. If it were a meteorite, it must have
fallen hundreds of millions of years ago into a sea. Some meteorites
have been found in sedimentary rocks. Such meteorites are called "fossil
meteorites."
This rock doesn't look much like a meteorite. The author admits, however,
that he's never seen a fossil meteorite or any meteorite that fell
into water.
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What is it?
This rock looks like a sedimentary rock, perhaps a conglomerate. There
seems to be a clast on the lower right and holes (casts) where other
pebbles have fallen out.
Sometimes rocks are carried out to sea by icebergs and get dropped
miles from shore when the ice melts. Sediment accumulation eventually
buries them. If the seafloor gets exposed millions of years later,
a sedimentary rock is formed.
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