ex. Dr. Werner Paar Collection A very rich specimen, smaller in size than others here but with a huge cavity, protecting beautiful sharp crystals to 3mm. This cavity is 2 cm wide, 2 cm long, and up to 5 mm across. Very rich! 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. The crystals are large for the species and not many specimens have been collected at the only location which now is abandoned.