Metallic-colored nodule with bronze tones, formed by Algodonite, a rare metalloid alloy of copper and arsenic, with metallic luster and coppery shades, mixed with Domeykite, another rare metalloid of arsenic and copper, and Arsenic, all forming the variety mohawkite, a true rarity from the American copper belt.
The Mohawk Mine is part of the Keweenaw copper district, developed in amygdaloidal basalt flows of the Proterozoic, belonging to the Lake Superior Igneous Province. The mineralization occurs in veins and replacement bodies with native copper, silver, and arsenides derived from late hydrothermal fluids. It is famous for the mohawkite variety, a natural mixture of Algodonite, Domeykite and Copper, as well as for rare species associated with Arsenic.
Mohawk Mine, Mohawk, Keweenaw County, Michigan USA
Specimen size: 6.0 × 5.o × 4.9 cm = 2.36” × 1.97” × 1.93”
|
