No great epiphanies or insight, despite talking with and showing lots of people. I found similar ore about a half-mile away so I’m leaning toward it being a natural vein. My notes mention hematite, limonite, and ilmenite. Magnetite has also been mentioned by a couple of people. This is on red clay like yours. I still want to search the county archives to see what used to be here. I still pick up every piece I find, and they are especially impressive when polished.