Some sort of metallic spherule?

Found in Central Texas near a large limestone cliff next to a creek. Doesn’t seem to be magnetic but might be weakly so- don’t have great magnets. Don’t have ceramic for scratch test. Almost perfectly spherical and super heavy for size (small plum)

Hard black exterior at first made me think “fusion crust” at first but it’s super spherical and again, not magnetic. Thoughts greatly appreciated.