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Was IRIDIUM ever found as a residue in ALABASTER or AGATE or CALCIUM from VOLTERRA, ITALY?
Question Date: 2014-01-23
Answer 1:

The answer is unlikely. All of our iridium comes from meteorites, because any iridium that was in the Earth sunk to the bottom because it's so heavy, so there's nothing in the crust.

Answer 2:

Iridium was found in a site in Italy at the Cretaceous-Tertiary boundary layer, and was used as one piece of evidence for a meteoritic mechanism for the mass extinction that coincides with that boundary.

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