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I was just reading about how Michigan had a volcano which deposited large amounts of nearly pure copper, and even some naturally alloyed bronze.
Geological activity gouged some crazy deep holes and dumped everything on top. Basically the entire upper peninsula was scooped out of lake Superior, flipped over and dumped on the ground, which is why there’s a bunch of metal everywhere up there.
Also some of the oldest exposed stone on the planet. Nothing too useful about it beyond “my, that’s a very old stone”, but it’s a vaguely fun fact.
That reminds me, I definitely need to track down some Mohawkite jewelry.
Sure, it’s technically toxic, but fashion always comes at a price.