Is it magnetic?
Not sure if you are asking about iron rocks in general or the OP's rock.
I think Magnetite is the only rock to be attracted to a magnet or to be magnetized.
Magnetite that is already magnetized in nature is called Lodestone.
I'm not sure what it is about them compared to other iron rocks that makes them have these properties. Just the right kind of iron I guess.
There might be a few other rock types I don't know about. Some rock types do but are very weak. I've just recently got into learning more about rocks and gems. I've always been interested in them but more so going to Graves Mountain and rock swaps.