Colusite
West Colusa Mine, Butte Mining District, Silver Bow County, Montana, USA
4.9 x 3.3 x 2.8 cm. Colusite is a very complex, unusual species with copper, vanadium, arsenic, tin, and antimony. This is a substantial chunk of rock, with lots of bronzy colusite on the surface. It is mostly not crystalline, but some is. And it is rich in material. Ex. John White Collection.
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