strange mineral identification.

[MikeWhite]

I hope than someone know something about this mineral of brown color.
It is like a glass inside with strange circular structure.

Thank you.
Mike

 

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[Keppy]

Looks like sea glass to me..

 

[MikeWhite]

It is founded far away from the sea. why is round in the middle? why is circles in the middle,
is that common?