Many meteorites have a substantial iron component, even if it’s not readily visible. Even L and LL meteorites have more iron than most earth rocks, which is why the quick and dirty field test for a meteorite (especially the older weathered ones) is to see if it is attracted to a rare earth magnet; ones like carbonaceous chondrites, eucrites and lodranites with minimal iron are rare. Unless it’s a brand new fall, a meteorite’s existing magnetic field has likely changed from its original, so very little scientific information would be lost.
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