What kinda rock is this????

[rferris75]

I found this in the park behind the house. I live in west tennesee and have never seen one of these. Its not metalic and my detectoer wont see it i just looked down and noticed it.

 

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[Montana Jim]

If you can focus on the rock better it might help... it's kinda fuzzy :P

 

[chefrider]

could be silicon.....Wikipedia has a picture and description