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by londons_explore 1243 days ago
Oddly, tiny chunks/slivers of magnesium are very flammable, but a big chunk of it is pretty much impossible to set fire to.

Source: I was disappointed to buy a few lbs of magnesium to burn on the bonfire, only to find that chucking a lump of it on the bonfire doesn't even burn. Shavings did though.