Malachite was found at numerous small copper deposits in the county, which formed as part of the Upper Mississippi Valley zinc-lead district. The copper deposits were particularly common in the Mineral Poiint area. Associated minerals are azurite, tenorite, chalcocite, chalcopyrite and iron oxides. 2 T.6N. R.1E. where it occurs with azurite, chalcocite, cuprite, chalcopyrite, aurichalcite, sphalerite and smithsonite. Here it occurs with azurite, chalcocite, cuprite, chalcopyrite, aurichalcite, sphalerite and smithsonite.
Malachite occurs with zinc and lead minerals in the SW sec.
Malachite occurs sporadically throughout the mines of the Upper Mississippi Valley zinc-lead district. It is commonly as thin crusts associated with other copper minerals. Malachite occurs in the SE NW sec. 36 T. 2N. R.3E. near Gratiot. Malachite occurs in the Dresser Trap Rock Quarry, sec.