Any ideas

[ismith26]

I have found this while at detecting at a school. About 8 inches down. It's heavy for its size and is slightly magnetic. Potential meteorite? Any input would be great.

 

[FoundInNC]

My guesses: either slag, product of acetylene torch cutting steel, or rusted clump of steel. It is probably mainly rust (iron oxide) and I do not think that completely oxidized iron is magnetic, which explains the faint attraction to the magnet