Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosi Department, Bolivia
A hard to find "cogwheel" group of sharp, thick, blocky modified twinned crystals of Bournonite with excellent metallic luster. The piece displays well from a few angles. The stacked appearance of the crystals, combined with the bright luster makes this one of the more eye-catching smaller Bournonites in this update. With so many average quality Chinese Bournonites on the market, these Bolivian pieces might get lost in the mix, but when they're good, they are very impressive.