San Jose Mine, Oruro City, Cercado Province, Oruro Department, Bolivia
Small Cabinet, 7.0 x 5.2 x 2.7 cm
This specimen is over 30 years old and was part of the best find of the material. There were only a handful of good specimens, and well crystallized pieces like this are few and far between. This is one of the rarest sulfosalts in the world. This specimen is a very rich, incredibly rare, superb, crystallized specimen of the triclinic lead, tin, iron, antimony sulfosalt Franckeite consisting of small bladed crystals forming spherical aggregates on matrix. This species belongs to the only group of minerals that forms in naturally "round" or "cylindrical" shaped crystals.