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Originally Posted by Nicolas
To me, both the internal structure and the surface structure make it seem as it this is metal scrap from a pouring line. It has a sort of droplet shape, and inside you see rings. The "feathers" are where the metal cracked during the pouring.
Just a guess of course.
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That's my first thought.
Similar (though not the same since it's a different metal) to the tin dregs that I've seen at the smelters where my Dad used to work.