What’s this?!?

[CoopFpv]

Was at a job site today and found these pieces. I picked them up as I thought they were out of place. Foundation just dug near Potomac river King George

 

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[paleomaxx]

It looks like a fire brick that was exposed to enough heat for the individual grains to start fusing into glass. It could have been a forge that was pushed too hot and they had to replace some of the bricks. Any sign of iron bits or ceramics in the surrounding soil?

 

[A2coins]

what he said just pretend I said it