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Iridium is one of the rarest non-radioactive, non-noble gas elements in the Earth's crust, but it is relatively common in meteorites. Iridium and osmium are the densest elements, and both are believed to have dropped below the Earth's crust toward the core when the Earth was young and molten. The concentration of iridium in meteorites matches the concentration of iridium in the Earth as a whole.
I believe that analysis of the asteroid sourced meteorites indicate that they were never a single body.