Meteorite Nantan

why would a Nantan meteorite be more likely to rust than other iron meteorites?

if i keep it in a sealed container safe from moisture will it be safe from rusting. so far it is entirely rust free.
i can see why Nantan would rust in situ cause it rains in China, but i've heard that specimens in collections are likely to rust. maybe it only applies to already partly rusted ones.

I checked the compositions of this and a few other iron-nickel meteorites. Nantan material has only slightly less Ni than Canyon Diablo meteorites (6.96% vs. 7.1%, and there is some variation between samples of both), but substantially less than the Hoba meteorite (16.4%). Maybe Canyon Diablo ones rust just as quickly?

Old hypothesis:
Probably has less nickel than others, but I would need to check this.




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