Bournonite ('cogwheels') on Sphalerite

Item Description

This is one of the few "cogwheel" specimens of Bournonite that we have offered for a while in the auctions. It's a wonderful small cabinet display specimens and features attractive, sharp, metallic, lustrous, silvery-grey color, "cogwheel"-shaped twinned crystal groups measuring up to 1.6 cm across aesthetically sprinkled over micro black Sphalerite matrix. The piece is in excellent shape overall, as I can only see one spot of noteworthy damage, with only a few small nicks here and there. This specimen is from a recent find in 2019 in Bolivia, and stands out as one of the better discoveries of this material in recent years. My favorite aspect of the piece is the fact that the "cogwheels" are well separated and not tightly intergrown into an undiscernible mass. If you're a fan of sulfosalts, metallic minerals or simply Bolivian material, don't miss out on this attractive display specimen of these beloved "cogwheel" Bournonites. Valued at $700.