Unknown rock

[wchollis]

I am not sure what kind of rock this is. I found it about 3 ft.down digging a foundation for my house in PA.
Thanks for any help.

 

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[against the wind]

Welcome to the forum from Port Allegheny, Pennsylvania

 

[Kray Gelder]

Looks like a large chert nodule. Pretty cool. A closeup of the dark center would be helpful.

 

[vpnavy]

1st - I noticed this was your very first post - so, Welcome Aboard wchollis from another resident of the great state of PA! Take a look at Sub-Forums: Pennsylvania for information (i.e., clubs, etc.) directly related to PA.

2nd - I moved from New Member Introductions over to Forum: Rocks/Gems for more exposure.

 

[wchollis]

It looks as if the clay around it is baked on,like it was hot at one time. The center is smooth and the white flecks are lint from paper towel.
I hope this picture helps.
Thanks

 

[Eu_citzen]

Kinda looks like a fine-grained mafic rock (or even amphibolite?) with a weathered surface. Not 100% sure, though.

 

[BLK HOLE]

I am not a rock dude but it is sure cool looking....Welcome to T-Net!

 

[A2coins]

welcome

 

[DDancer]

While I like the idea of a chert its coloration puts me in mind of a banded jasper nodule. Chert/Flint/Jasper are all very similar materials with color, formation and luster being used for identification. Locality helps as well in many cases. A very nice specimen, I wonder what the unbroken one would slab out to look like.