Are we sure that it's well associated with it's base?
If not, it could be some electrostatic effect "floating" the flake instead of a ventifact.
Yes geonuts, et is alwayson the prowl to apply some E-n-M where it probably doesn't go. Hmmm, cathodic anti-rust protection on my rock hammer voice-in-my-head? That's a wonderful idea!
;)