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Chemical formula of bornite?

  1. Apr 26, 2015 #1
    What's the chemical formula of bornite?According to wikipedia
    it is Cu5FeS4.According to http://www.spiritofisis.org/knowledge/crystal_files/bornite.htm [Broken]
    it is Cu2FeS4 and as per my textbook it is Cu3FeS2.Now,What's the actual chemical formula of bornite?I am really confused.
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Apr 26, 2015 #2


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    Staff: Mentor

    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."
  4. Apr 26, 2015 #3
    Yes.You are right.Thanks for your answer @ Borek
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