Why this rock is probably not a meteorite:
This is another one with a good story. It was found by someone diving
in a cave in Florida. It was buried
in a layer of shells 9 feet below the surface.
The specific gravity, 2.6, is much too low
for a meteorite. It's composed of calcite (fizzes when acid is dropped
on it), and meteorites are never composed of calcite.
It's
got cylindrical casts of some form of sea life (coral?). Finally,
it was clearly formed (bottom photo of sawn face) by concentric deposition
of calcite. Meteorites never have such a feature.
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What is it?
We don't know, but it formed in the sea. It
does not burn when put in a flame, so the dark coating is not petroleum.
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