A very rich specimen of this extreme rarity with thick mattes of crystals to several mm in size. Some are damaged a bit, but there is much good material here also. This Pb-Sn-S mineral, similar in overall appearance with teallite, is a unique mineral. Pirquitas is the only worldwide occurrence. This is astonishing because a tin-rich mineralogy including franckeite, cylindrite, teallite etc. but without suredaite is wide-spread throughout the famous Ag-Sn belt extending from Bolivia into NW-Argentina. Though massive suredaite is fairly common in one sector at Pirquitas, crystals were never common. These crystallized specimens are all from a small lot found in the last few years. The crystals are really unprecedented for the species and not many specimens have been collected at the only location which now is abandoned. (TYPE LOCALITY)