Mohawkite, a mixture of algodonite, domeykite and arsenic-rich copper, was originally described from the Mohawk-Ahmeek area of Keweenaw County in Michigan. This 3.4-ounce nugget has been polished to show its pretty silvery tone with a hint of gold. We recently acquired the only available stash we know about of this material, which was mined in the 1950s. It had been sitting in a garage for a long, long time.