Bournonite ("cogwheel") on Pyrite

Item Description

One of the better "cogwheel" specimens of Bournonite that I have offered from Bolivia in the auctions for a while. This piece is an attractive, sharp, fairly thick, prismatic, lustrous, metallic, silvery-grey color, "cogwheel"-shaped crystal group sitting on Pyrite. This specimen is from a find in 2005 in Bolivia, with the exception of a few rough spots, is in great shape overall from the standpoint of damage. Comparatively, the Bolivian Bournonite "cogwheels" are priced significantly lower than their contemporary Chinese counterparts, and a piece like this from Machacamarca is very difficult to find.