Can someone help me identify this?

[Farm]

Found this is in a plowed up field near Lincolnshire uk. Any info would be greatly appreciated.

 

Amazon Forum Fav 👍

Minelab PRO-FIND 35 Waterproof Pinpointer Metal Detector for Experts with Tone ID & Adjustable Sensitivity - Grab it through Amazon!

[Lenrac2]

Interesting!

 

[Steve in PA]

Might be a piece of slag from iron making operations.

 

[smokeythecat]

Yes, it is slag from iron workings in the past. The air bubbles are the giveaway.