WGNHS
Wisconsin Geological and Natural History Survey

Wittichenite

Dark mass of wittichenite on white quartz with button of yellow siderite. Field of view is about 0.3 mm diagonally. Flambeau Mine, Ladysmith, Rusk County, Wisconsin. (Image by Dan Behnke.)

Formula: Cu3BiS3 Orthorhombic

Description:

Wittichenite is an uncommon bismuth-rich mineral found in a variety of hydrothermal deposits.

RUSK COUNTY:  Small black masses of wittichenite were found in quartz, siderite and copper sulfides at the Flambeau Copper Mine near Ladysmith. Identity verified by EDS and in-situ XRD, courtesy of Mike Wise, Smithsonian.