Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia
A fantastic miniature specimen from this classic locality. It comprises several very attractive, sharp, tabular, "cogwheel"-shaped twinned crystals of metallic grey Bournonite forming what is a very well-balanced and eye-catching display piece. As you can see from the photos, the piece can be shown from several angles, and is virtually damage free on the main display side. Rarely are the Bournonites from this mine found in such attractive crystal groups like this one.