What Is the Chemical Formula of Bornite?

AI Thread Summary
The chemical formula of bornite is debated, with sources citing different formulas: Wikipedia lists it as Cu5FeS4, while another source claims Cu2FeS4, and a textbook states Cu3FeS2. The discussion highlights the complexity of bornite's composition, noting that substantial variations in the amounts of copper and iron can occur. It also mentions that solid solutions can extend towards related minerals like chalcopyrite and digenite, and that exsolution of other sulfide minerals is common in bornite.
gracy
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What's the chemical formula of bornite?According to wikipedia
http://en.wikipedia.org/wiki/Bornite
it is Cu5FeS4.According to http://www.spiritofisis.org/knowledge/crystal_files/bornite.htm
it is Cu2FeS4 and as per my textbook it is Cu3FeS2.Now,What's the actual chemical formula of bornite?I am really confused.
 
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gracy said:
According to wikipedia

Never hurts to read the entire article:

"Substantial variation in the relative amounts of copper and iron is possible and solid solution extends towards chalcopyrite (CuFeS2) and digenite (Cu9S5). Exsolution of blebs and lamellae of chalcopyrite, digenite, and chalcocite is common."
 
Borek said:
Never hurts to read the entire article:
Yes.You are right.Thanks for your answer @ Borek
 

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