Too much of the copper ingredients results in excesses of copper oxides cuprite and tenorite. Copper(I) oxide is found as the reddish mineral cuprite. Mining also takes place, with deposits of iron ore, cuprite, and other minerals. Associated minerals are quartz, limonite, azurite, malachite, cuprite, and other secondary copper minerals. In addition, lesser amounts of malachite, azurite, cuprite, and native copper were present. When heated, paramelaconite breaks down into a mixture of tenorite and cuprite. At San Juan, Chile, it is associated with erythrite, cuprite, malachite and cobaltian wad. Oxides with a 2&colon;1 ratio include cuprite (CuO) and water ice. Chalcopyrite can be oxidized to form malachite, azurite, and cuprite. It occurs in association with cuprite, brochantite, linarite, caledonite, malachite, chrysocolla and its polymorphs. It occurs in association with atacamite, chrysocolla, connellite, cuprite, dioptase, goethite, malachite, plancheite, and tenorite. Minerals include chalcocite, bornite and chalcopyrite, with associated malachite, azurite and cuprite. Above the water table, chalcocite has been oxidized to malachite, azurite, tenorite, and cuprite. Some of these minerals include cuprite, aragonite, wulfenite, malachite, azurite, and galena.