I picked it up from a heap of soil that came off an excavation. It is slightly magnetic ie attaches to a magnet on a string.enter image description here

closed as unclear what you're asking by Spencer, trond hansen, Gimelist, Fred, daniel.neumann Nov 9 at 8:38

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • 4
    It looks like iron slag, a byproduct of iron refining. – The Garage Chemist Nov 8 at 21:08

Browse other questions tagged or ask your own question.