Dims: 1.03x0.77x0.69" (2.62x1.96x1.76cm)
Wt: 42.0ct (8.1g)
Uchucchacua, Lima, Peru
While there are perhaps a dozen small crystals on this specimen, it is dominated by a single large crystal of polybasite, whose visible dimensions are roughly 9mm on a side. The crystal has a black color with just a hint of red, and distinct red flashes are visible where ever internal fractures are close to the surface. The crystal has a distinct but distorted shape, with clear rhombohedral striations.