Nantan Meteorite

where did the nantan meteorite come from?

I would think that it would be impossible to answer but who knows!

Most likely the main asteroid belt. The large iron crystals suggest that the is was once part of a large molten mass, that slowly cooled over millions of years.
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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 …

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