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.
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.


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.