This is a really fine display quality miniature of polybasite, one of the more uncommon silver species in such form. It is coated in some places by a very thin layer of oxidized chalcopyrite, which gives it a sparkling golden color and shimmer in the cracks and crevasses. Large and well formed, these crystals reach 3 cm across. Featured in the Mineralogical Record September 2016 issue on the locality.
Ex. Evan Jones and Dave Stoudt collections.