Why this rock is probably not a meteorite:
This one came from near Tucson. It registered on a metal detector.
Up close, many of the the "clasts" (which are really
phenocrysts) are rectangular. That's a sure sign that the rock is
not a meteorite.
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What is it?
Another porphyritic volcanic rock. Such rocks are common in the mountains
of southeast Arizona. It probably contains a smidge of magnetite.
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