Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia
One of the best quality Bournonites in the lot that I purchased. The photos do not do this piece justice as the luster is very good compared to most. It is a multi-crystal group comprising a few rather thick blades with stepped faces and the classic "gun metal" appearance. A few trivial nicks around the edges keep this from being a top-notch miniature, but the quality is there, and the fact that it is not a single crystal but rather a group of crystals, is rare from this mine.