A really large, pure Stephanite specimen that shows complex crystal faces on every side. In exceptional condition, besides being large this has a brilliant bright Silver luster. Stephanite is one of more rare Silver minerals and is soft (2-2.5) brittle and so not usually seen in such fine condition.
An older Fresnillo specimen this locality only rarely produced any specimens larger than thumbnails, and for that matter this is a large piece from anyplace. The intergrown sections of crystals are still very sharp with well defined striations and what seems to be many twin planes. A fine addition for a serious Silver suite or Mexican mineral collection.