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this would make a nice addition to any thumbnail suite
and eye-catching “closed” twin of Ferberite with great form
Specimen # CUAUS72011
this was one of only a handful of crystals recovered according to my source who acquired them directly at the locality
Considering the millions of tons of tin ore that Bolivia has yielded
Bournonite (“cogwheels”) black this would make a niceA 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 available. Specimen # BOL711B23
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