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which is typically what you would expect out of a metamorphic contact like this
excellent quality
Specimen# CO712B131
Good Bolivian Coppers are not common on the market
Considering the millions of tons of tin ore that Bolivia has yielded
Bournonite (“cogwheels”) black which is typically what youA 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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