The cobalt ores at these localities occur with pyrites and chalcopyrite as bands in gneiss.
chalcopyrite, from near Leesburg, said to be a promising vein.
Differs from chalcopyrite by paler color and much greater hardness.
Next to chalcopyrite, copper-glance is the most important ore of copper.
chalcopyrite is of wide distribution and is the commonest of the ores of copper.
Copper-glance readily alters to other minerals, such as malachite, covellite, melaconite and chalcopyrite.
If chalcopyrite (copper-iron sulphide) is present the spots may be bright green in colour.
Later still experiments were made with other metallic-looking ores, such as chalcopyrite, and the metal age had come.
Both chalcocite and chalcopyrite frequently occur in silver-bearing rocks.
Much of the copper of commerce is made from chalcopyrite and bornite, and these ores are more difficult to work.
A brassy yellow, metallic, tetragonal mineral, usually occurring as shapeless masses of grains. Chalcopyrite is found in igneous rocks and copper-rich shales, and it is an important ore of copper. Because of its shiny look and often yellow color, it is sometimes mistaken for gold, and for this reason it is also called fool's gold. Chemical formula: CuFeS2.