Chalcocite

specimen number:
8311107

location:
Flambeau Mine, Rusk Co., Wisconsin, USA

description:
An attractive cluster of blue iridescent crystallized chalcocite without matrix. Very slight damage on the back of the piece, this still in very good condition and quite choice for this notable find.

The Flambeau Mine in Rusk County, Wisconsin, was an open pit copper and gold mine that operated from 1993 to 1997. The deposit was a volcanogenic massive sulfide ore body hosted in Precambrian volcanic rocks. During mining, rich secondary enrichment zones were encountered that produced copper sulfide minerals. Chalcocite occurs at the mine as dark gray to black metallic masses and crystalline coatings formed by the alteration and enrichment of primary copper minerals such as chalcopyrite. Specimens from the Flambeau Mine are valued by collectors for their well developed sulfide mineralization and associations.

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