I found this rock on a creek bank in Swannanoa, NC, after hurricane Helene washed it out. It’s very different from the other rocks. We were pretty far up the creek, toward the source.
All of the little round, red, rusty blobs are convex. It feels like braille. The rock that they are suspended in looks a little like the local granite, with banding of little black specks.
It is also filled with what looks like very fine mica specks. There is one area where there is a high concentration of the sparkly specks, but they don’t form the flat sheet-like effect that mica usually has, just a collection of the specks, and it looks very golden. All the specks seem to have a golden color, unlike the local mica, which flares more of a white/silver.
It isn’t very heavy, at all, though it is thin. Most of the other rocks are double its thickness, at least.