Artifact or Geological Phenomenon? Take 2

[suskypaddler]

I figured out how to load pictures....Again I found this is south eastern Pennsylvania on a friends property. I found it a while ago and originally dismissed it as just a cool looking rock but I cleaned it really good and now I am not sure.

Any Thoughts or opinions? Thanks

 

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[texjim]

looks like a rock to me but i am no expert to by any means.

 

[RelicDude]

In the first picture it looks like glass slag.

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