✅ SOLVED What is it?

[Truthseeker411]

Ok, need some help, this is a field find, many more pieces around also,

 

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[HuntinDog]

Look like a slag of some sort

 

[A2coins]

Yeo slag I find lots of those

 

[VictorVincimus]

Definitely slag. I have old iron furnaces all around me in the rivers and this is everywhere.

 

[Truthseeker411]

Wouldn't it be magnetic, its not attracting to a strong magnet,