That's really an interesting find. It looks like a human made metal to me, but on the off chance it is a mineral, have you thought of performing a streak test or a hardness test?
Traditionally they use a piece of unglazed porcelain tile to scrape the mineral on, and note the color of the streak. Galena, I think is a gray streak, hematite is reddish or reddish brown. Sometimes you can just rub the specimen on a concrete slab or block.
For hardness, for example, can you scratch it with a fingernail? (probably not!) If not, can you scratch with a copper penny? (pre 1982) If not, with a penknife, a piece of glass, a piece of quartz, etc? That might tell you something.