Franckeite (Var: Potosiite)
San Jose Mine, Oruro City, Cercado Province, Oruro Department, Bolivia
Small Cabinet, 6.0 x 4.9 x 4.6 cm
From the new find of 2004. A few highly lustrous, heavily striated, tabular blades of Potosiite measuring up to 8 mm sitting atop Franckeite. For those of you who are unaware, the crystals of Potosiite on this specimen are EXCEPTIONALLY LARGE for the species. Before these new specimens were discovered, some of the largest known crystals of Potosiite were massive, uncrystallized, granules less than 1 mm. in most cases. The Potosiite has been positively identified through X-ray Diffraction. This specimen is from a newly opened vein in this historic mine. 6.0 x 4.9 x 4.6cm