A way to tell the difference between bornite and acid-treated chalcopyrite is to use a streak plate; bornite streaks dark gray and chalcopyrite streaks a green tinged black. Well, ok, this is what I've found--some of the confusion lies in the fact that chemically speaking, Chalcopyrite and Bornite are sooooooo close, hold on nah, so I'm gonna go science on ya for a moment--Chalcopyrite is CuFeS 2 with Bornite being Cu 5 FeS 4 both are copper iron sulfides. Bornite is an important copper ore mineral found in many different types of copper deposit. Balzar calls this the stone of joyfulness. It can, however, be leached under oxidizing conditions at elevated temperatures or by microbial leaching under low-potential conditions (Gericke, Govender, & Pinches, 2010).This has led to extensive study into leaching of chalcopyrite concentrates as an alternative to smelting. Leaching at 90°C in the presence of 0.1 M ferric ions in 0.1 M sulphuric acid provided the best results with 90% copper extraction from the mixtures in 6 hours. This stone of happiness and joy will help you tune into positive forces in life and channel that energy to others.

Bornite commonly occurs with other copper sulphide minerals such as chalcocite and weathers, or “oxidizes”, to malachite. Peacock Ore, also known as Bornite, is a copper mineral mined in Mexico. It is Orthorhombic but commonly is massive and/or granular in habit. Bornite was much easier to be oxidized rather than to be reduced, and chalcopyrite was difficult to be both oxidized and reduced. Chalcopyrite is essentially unleached under the mild oxidizing conditions of heap leaching (very slow leach kinetics). Amanda Think of your specimen not so much as "Chalcopyrite" but as an "Ore of Copper". Known for its iridescent colors, it was nick-named peacock ore by early miners. The sulfide bornite [Cu 5 FeS 4] is also an important copper ore (close to 65% by mass), especially in the copper porphyry deposits. Bornite is heavier than an equal volume of chalcopyrite ( 5.1 vs. 4.1) 30th Jan 2010 23:15 GMT Bob Southern. However, the two are often found together and many rocks are a mix of the two. However, the chalcopyrite you see that looks like bornite has been treated with acid (it is more common than bornite and is often sold as bornite, so be wary of scams). The electrochemical dissolution process of chalcopyrite and bornite in acid bacteria culture medium was investigated by electrochemical measurements and X-ray photoelectron spectroscopy (XPS) analysis. We report the replacement of chalcopyrite by bornite under hydrothermal conditions in solutions containing Cu(I) and hydrosulfide over the temperature range 200–320 °C at autogenous pressures. The results showed that a synergistic effect existed between chalcopyrite and bornite during bioleaching by both …