Bournonite (''cogwheel'')

Item Description

This prestigious mine has become one of the foremost producers of fine quality Bournonite specimens in the world. With that said, superb Bournonites are only found in a handful of world localities, and the specimens from the Yaogangxian mine are among the best extant. This piece is an impressive, sharp, well-formed, silvery-grey color, metallic, prismatic "cogwheel"-shaped crystal of Bournonite free of matrix. There are some rough spots on the piece, so it's not 100% perfect, but it's still a very good sized "cogwheel" on a worldwide scale. In my experience Bournonite crystals of this size are not common from any locality, especially 2.5-inch prismatic "cogwheels" like this, and this is a good overall example of the Yaogangxian specimens. Valued $2,000.