Chalcopyrite Chalcopyrite Chalcopyrite ( ) is a copper iron sulfide mineral that crystallizes in the tetragonal system. It has the chemical formula CuFeS. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale. Its streak is diagnostic as green tinged black. On exposure to air, chalcopyrite oxidises to a variety of oxides, hydroxides and sulfates. Associated copper minerals include the sulfides bornite (CuFeS), chalcocite (CuS), covellite (CuS), digenite (CuS); carbonates such as malachite and azurite, and rarely oxides such as cuprite (CuO). Chalcopyrite is rarely found in association with native copper. Natural
Ore Mountains animals that have been found at higher altitudes of the Ore mountains are otherwise only known from more distant places in the Sudeten mountains or the Alps. After conditions improved, once displaced species such as Eagle owls and Black storks have returned in the early 21st century. The German part of the Ore Mountains is one of the major business locations in Saxony. The region has a high density of industrial operations. Since 2000, the number of industrial workers has risen against the Germany-wide trend by about 20 percent. Typical of the Ore Mountains are mainly small, often owner-managed, businesses.