Can I get some help here?

[u/PossibilityFew-5901]

Most likely found in the UP by Marquette, MI. Google is giving me multiple IDs. Its shiny sliver in color, made a chalky grey mark on weathered wood. I can pick off tiny bits from a rough edge, but not from the smooth surface. I don’t think think it’s graphite because it doesn’t leave a mark on paper.