Natural or Manufactured?

The stone is maybe two inches long.
The stone is maybe two inches long.
This is the other side of the same stone.  There seems to be a small groove cut into it.
This is the other side of the same stone. There seems to be a small groove cut into it.

I found an interesting stone in our back yard. That got me to thinking, could this have occurred naturally, or did someone make it? Something so long and thin would seem to be fragile.

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