Common mineral

[Ninjafossils]

I find tons of this mineral around my property, but I have no idea what it is. It is always a black a blue injury color, with a bubbly form.

 

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[rock]

More slag I do believe.

 

[Ninjafossils]

Slag? Enlighten me.

 

[Turkısh Man]

Pic is too small to ID.

 

[Eu_citzen]

Slag? Enlighten me.

By product from metal production or glass making, for example.

Slag - Wikipedia, the free encyclopedia