odd iron laden ?

[artyfacts]

Was out hunting in a field and walked by this odd ball. I stopped picked it up and thought concrete and dropped it. I started thinking about the iron deposits and walked back and lugged it around until I got back to the truck. I originally thought the holes were where stones were lodged but under a closer look noticed no sand or stones created the holes and it is very heavy and laden with iron. Any thoughts as to what this is? Art

 

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[pannerman]

It looks like pumice or scoria.

 

[artyfacts]

It looks like pumice or scoria.

Yes it does at that. The base is less pocketed almost a solid flecked with iron throughout.