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Can anyone help identify an Unknown Metal Object?

It is silver, no rust and it will not be scratched by anything. It is magnetic, it's about as round as a quarter, and maybe an inch thick. It weighs 150 grams, or 5.37 oz. It randomly appeared on my back porch one day. The top looks like a bundt cake design, the bottom is flat with a perfect circle in the middle. I found it in Southern Missouri. I have asked multiple people and no one has any clue as to what this could be. I would say its a meteorite, but the shape of it is unlike any meteorite I've ever seen.  Any referrals or thoughts about what this could be would be gratefully appreciated!!! 

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It looks more like someone used a metal stiring rod while casting metal.
The flat area is man made and would indicate a cut off.
Judging by the shape and smoothness however I tend to say it is from a galvanising electrode. I had gold looking pretty much the same just bigger and with some "arms grown out".
If you check the roud center it should either be stainless steel, tungsten or titanium - none of the three will be easily scratched by normal tools.
As you already confirmed it is magnetic you can do further chemical test (acid and so on) to find out what it is made from.
It does not rust, so no iron, leave Nickel or Cobalt, from the color it should be nickel and would confirm my theory about a galvanising process.

KadieJ1 (author)  Downunder35m1 year ago

Solved!!!! Thank you so much for your keen observation! I found out, with your help, that it is pure elemental Nickel, obtained through electrolysis. How it got on my back porch will remain a mystery though!

Most likely someone working in galvanics used these electrode off cuts for a slingshot.
Damn hard, heavy and flies very far in a proper one.

KadieJ1 (author) 1 year ago

Solved!!!! It is pure elemental Nickel, obtained through electrolysis. How it got on my back porch will remain a mystery though!

iceng KadieJ11 year ago

funny