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Originally Posted by The Bad Astronomer
I was thinking about this just today, coincidentally. One problem is distinguishing them from slag; vaporized iron in the air. Supposedly, the terrestrial iron is not in little spherules, but I really need to track this one down. Perhaps testing the spherules for nickel content might finally nail this down.
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In a book called
Experiments in Space Science by Peter Greenleaf
There is one such experiment. According to the book, the seperation of cosmic dust from earthly dust involves using a microscope to classify it into groups based on shape and size. In the second (post shower) there should be a different group(s) of particles present.
The book also says that stony particles of cosmic origin could be found the same way.
There seems to be alot about this of the web too. One description saying the iron particles will be sphereical and pitted.