„Fingerprint“ Galenas

Very interesting 30 years old piece of Galena, Sphalerite (Marmatite and quartz). Well developed large crystals of galena ( combination of cub and octahedron) on the top of transparent quartz crystals, fallowed by shiny sphalerite crystals with perfect termination. Galena was secondary  particulary dissolved, what form some wavws on the top of the crystals, reminding fingerprints.