Different formulas for copper pyrites and bauxite

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In my book in the chapter on General Principles and Processes of Isolation of Elements, I found that the formula for copper pyrites was stated as $ceCu2S.Fe2S3$ at one place, $ceCuFeS2$ at another place and $ceCu2FeS2$ at another place.



Are all these taken to be the formula for copper pyrites or are these printing mistakes. I have searched the internet but could not find any useful information regarding this.










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    4












    $begingroup$


    In my book in the chapter on General Principles and Processes of Isolation of Elements, I found that the formula for copper pyrites was stated as $ceCu2S.Fe2S3$ at one place, $ceCuFeS2$ at another place and $ceCu2FeS2$ at another place.



    Are all these taken to be the formula for copper pyrites or are these printing mistakes. I have searched the internet but could not find any useful information regarding this.










    share|improve this question











    $endgroup$














      4












      4








      4





      $begingroup$


      In my book in the chapter on General Principles and Processes of Isolation of Elements, I found that the formula for copper pyrites was stated as $ceCu2S.Fe2S3$ at one place, $ceCuFeS2$ at another place and $ceCu2FeS2$ at another place.



      Are all these taken to be the formula for copper pyrites or are these printing mistakes. I have searched the internet but could not find any useful information regarding this.










      share|improve this question











      $endgroup$




      In my book in the chapter on General Principles and Processes of Isolation of Elements, I found that the formula for copper pyrites was stated as $ceCu2S.Fe2S3$ at one place, $ceCuFeS2$ at another place and $ceCu2FeS2$ at another place.



      Are all these taken to be the formula for copper pyrites or are these printing mistakes. I have searched the internet but could not find any useful information regarding this.







      inorganic-chemistry notation metallurgy






      share|improve this question















      share|improve this question













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      share|improve this question








      edited Jan 26 at 19:43









      andselisk

      16.1k653114




      16.1k653114










      asked Jan 26 at 18:45









      MrAPMrAP

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      29721034




















          2 Answers
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          7












          $begingroup$

          Both $ceCu2S.Fe2S3$ and $ceCuFeS2$ are the equivalent means to denote chalcopyrite. The first notation, $ceCu2S.Fe2S3$, commonly used a few decades ago, shows that two sulfides are not just a mechanical mix, but form a chemical compound (same as for crystallohydrates, e.g. $ceCuSO4 * 5 H2O$). The second one, $ceCuFeS2$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ceABX2$ type, crystallizes in $Ibar42d$ space group.



          enter image description here



          Figure 1. Unit cell of chalcopyrite $ceCuFeS2$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



          On the other hand, $ceCu2FeS2$ is a reduced formula of $ceCu8Fe4S8$, a superstructured bornite [1]. A compound of $ceAB2X2$ type, crystallizes in $Fbar43m$ space group.



          Unit cell of superstructured bornite



          Figure 2. Unit cell of superstructured bornite $ceCu8Fe4S8$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



          Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ceCu2FeS2$ is an outlier among the three and is probably a typographic issue. Also, it's not a good practice to mix dot-notated formulas with formula unit representations unless one wants to underline some structural aspects (e.g. molecular assemblies/coordination polyhedra/domains etc.)



          References



          1. Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ceFe/Cu$ Ordering Schemes in the 2a Superstructure of Bornite ($ceCu5FeS4$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.





          share|improve this answer











          $endgroup$




















            3












            $begingroup$

            I know of five copper iron sulfide minerals:



            Bornite - $ceCu5FeS4$



            Chalcopyrite - $ceCuFeS2$



            Cubanite - $ceCuFe2S3$



            Idaite - $ceCu5FeS6$



            Isocubanite - $ceCuFe2S3$






            share|improve this answer









            $endgroup$








            • 2




              $begingroup$
              Here is some more: talnakhite $ceCu18Fe16S32$, valleriite $ceCu2Fe4S7$, fukuchilite $ceCu3FeS8$, nukundamite $ceCu_3.39Fe_0.61S4$, haycockite $ceCu4Fe5S8$, mooihoekite $ceCu9Fe9S16$.
              $endgroup$
              – andselisk
              Jan 26 at 20:05











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            2 Answers
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            $begingroup$

            Both $ceCu2S.Fe2S3$ and $ceCuFeS2$ are the equivalent means to denote chalcopyrite. The first notation, $ceCu2S.Fe2S3$, commonly used a few decades ago, shows that two sulfides are not just a mechanical mix, but form a chemical compound (same as for crystallohydrates, e.g. $ceCuSO4 * 5 H2O$). The second one, $ceCuFeS2$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ceABX2$ type, crystallizes in $Ibar42d$ space group.



            enter image description here



            Figure 1. Unit cell of chalcopyrite $ceCuFeS2$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



            On the other hand, $ceCu2FeS2$ is a reduced formula of $ceCu8Fe4S8$, a superstructured bornite [1]. A compound of $ceAB2X2$ type, crystallizes in $Fbar43m$ space group.



            Unit cell of superstructured bornite



            Figure 2. Unit cell of superstructured bornite $ceCu8Fe4S8$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



            Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ceCu2FeS2$ is an outlier among the three and is probably a typographic issue. Also, it's not a good practice to mix dot-notated formulas with formula unit representations unless one wants to underline some structural aspects (e.g. molecular assemblies/coordination polyhedra/domains etc.)



            References



            1. Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ceFe/Cu$ Ordering Schemes in the 2a Superstructure of Bornite ($ceCu5FeS4$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.





            share|improve this answer











            $endgroup$

















              7












              $begingroup$

              Both $ceCu2S.Fe2S3$ and $ceCuFeS2$ are the equivalent means to denote chalcopyrite. The first notation, $ceCu2S.Fe2S3$, commonly used a few decades ago, shows that two sulfides are not just a mechanical mix, but form a chemical compound (same as for crystallohydrates, e.g. $ceCuSO4 * 5 H2O$). The second one, $ceCuFeS2$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ceABX2$ type, crystallizes in $Ibar42d$ space group.



              enter image description here



              Figure 1. Unit cell of chalcopyrite $ceCuFeS2$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



              On the other hand, $ceCu2FeS2$ is a reduced formula of $ceCu8Fe4S8$, a superstructured bornite [1]. A compound of $ceAB2X2$ type, crystallizes in $Fbar43m$ space group.



              Unit cell of superstructured bornite



              Figure 2. Unit cell of superstructured bornite $ceCu8Fe4S8$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



              Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ceCu2FeS2$ is an outlier among the three and is probably a typographic issue. Also, it's not a good practice to mix dot-notated formulas with formula unit representations unless one wants to underline some structural aspects (e.g. molecular assemblies/coordination polyhedra/domains etc.)



              References



              1. Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ceFe/Cu$ Ordering Schemes in the 2a Superstructure of Bornite ($ceCu5FeS4$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.





              share|improve this answer











              $endgroup$















                7












                7








                7





                $begingroup$

                Both $ceCu2S.Fe2S3$ and $ceCuFeS2$ are the equivalent means to denote chalcopyrite. The first notation, $ceCu2S.Fe2S3$, commonly used a few decades ago, shows that two sulfides are not just a mechanical mix, but form a chemical compound (same as for crystallohydrates, e.g. $ceCuSO4 * 5 H2O$). The second one, $ceCuFeS2$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ceABX2$ type, crystallizes in $Ibar42d$ space group.



                enter image description here



                Figure 1. Unit cell of chalcopyrite $ceCuFeS2$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



                On the other hand, $ceCu2FeS2$ is a reduced formula of $ceCu8Fe4S8$, a superstructured bornite [1]. A compound of $ceAB2X2$ type, crystallizes in $Fbar43m$ space group.



                Unit cell of superstructured bornite



                Figure 2. Unit cell of superstructured bornite $ceCu8Fe4S8$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



                Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ceCu2FeS2$ is an outlier among the three and is probably a typographic issue. Also, it's not a good practice to mix dot-notated formulas with formula unit representations unless one wants to underline some structural aspects (e.g. molecular assemblies/coordination polyhedra/domains etc.)



                References



                1. Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ceFe/Cu$ Ordering Schemes in the 2a Superstructure of Bornite ($ceCu5FeS4$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.





                share|improve this answer











                $endgroup$



                Both $ceCu2S.Fe2S3$ and $ceCuFeS2$ are the equivalent means to denote chalcopyrite. The first notation, $ceCu2S.Fe2S3$, commonly used a few decades ago, shows that two sulfides are not just a mechanical mix, but form a chemical compound (same as for crystallohydrates, e.g. $ceCuSO4 * 5 H2O$). The second one, $ceCuFeS2$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ceABX2$ type, crystallizes in $Ibar42d$ space group.



                enter image description here



                Figure 1. Unit cell of chalcopyrite $ceCuFeS2$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



                On the other hand, $ceCu2FeS2$ is a reduced formula of $ceCu8Fe4S8$, a superstructured bornite [1]. A compound of $ceAB2X2$ type, crystallizes in $Fbar43m$ space group.



                Unit cell of superstructured bornite



                Figure 2. Unit cell of superstructured bornite $ceCu8Fe4S8$. Color code: $color#FFFF30Largebullet~ceS$; $color#E06633Largebullet~ceFe$; $color#C88033Largebullet~ceCu$.



                Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ceCu2FeS2$ is an outlier among the three and is probably a typographic issue. Also, it's not a good practice to mix dot-notated formulas with formula unit representations unless one wants to underline some structural aspects (e.g. molecular assemblies/coordination polyhedra/domains etc.)



                References



                1. Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ceFe/Cu$ Ordering Schemes in the 2a Superstructure of Bornite ($ceCu5FeS4$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Jan 26 at 19:57

























                answered Jan 26 at 19:40









                andseliskandselisk

                16.1k653114




                16.1k653114





















                    3












                    $begingroup$

                    I know of five copper iron sulfide minerals:



                    Bornite - $ceCu5FeS4$



                    Chalcopyrite - $ceCuFeS2$



                    Cubanite - $ceCuFe2S3$



                    Idaite - $ceCu5FeS6$



                    Isocubanite - $ceCuFe2S3$






                    share|improve this answer









                    $endgroup$








                    • 2




                      $begingroup$
                      Here is some more: talnakhite $ceCu18Fe16S32$, valleriite $ceCu2Fe4S7$, fukuchilite $ceCu3FeS8$, nukundamite $ceCu_3.39Fe_0.61S4$, haycockite $ceCu4Fe5S8$, mooihoekite $ceCu9Fe9S16$.
                      $endgroup$
                      – andselisk
                      Jan 26 at 20:05
















                    3












                    $begingroup$

                    I know of five copper iron sulfide minerals:



                    Bornite - $ceCu5FeS4$



                    Chalcopyrite - $ceCuFeS2$



                    Cubanite - $ceCuFe2S3$



                    Idaite - $ceCu5FeS6$



                    Isocubanite - $ceCuFe2S3$






                    share|improve this answer









                    $endgroup$








                    • 2




                      $begingroup$
                      Here is some more: talnakhite $ceCu18Fe16S32$, valleriite $ceCu2Fe4S7$, fukuchilite $ceCu3FeS8$, nukundamite $ceCu_3.39Fe_0.61S4$, haycockite $ceCu4Fe5S8$, mooihoekite $ceCu9Fe9S16$.
                      $endgroup$
                      – andselisk
                      Jan 26 at 20:05














                    3












                    3








                    3





                    $begingroup$

                    I know of five copper iron sulfide minerals:



                    Bornite - $ceCu5FeS4$



                    Chalcopyrite - $ceCuFeS2$



                    Cubanite - $ceCuFe2S3$



                    Idaite - $ceCu5FeS6$



                    Isocubanite - $ceCuFe2S3$






                    share|improve this answer









                    $endgroup$



                    I know of five copper iron sulfide minerals:



                    Bornite - $ceCu5FeS4$



                    Chalcopyrite - $ceCuFeS2$



                    Cubanite - $ceCuFe2S3$



                    Idaite - $ceCu5FeS6$



                    Isocubanite - $ceCuFe2S3$







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered Jan 26 at 19:10









                    MaxWMaxW

                    14.7k12158




                    14.7k12158







                    • 2




                      $begingroup$
                      Here is some more: talnakhite $ceCu18Fe16S32$, valleriite $ceCu2Fe4S7$, fukuchilite $ceCu3FeS8$, nukundamite $ceCu_3.39Fe_0.61S4$, haycockite $ceCu4Fe5S8$, mooihoekite $ceCu9Fe9S16$.
                      $endgroup$
                      – andselisk
                      Jan 26 at 20:05













                    • 2




                      $begingroup$
                      Here is some more: talnakhite $ceCu18Fe16S32$, valleriite $ceCu2Fe4S7$, fukuchilite $ceCu3FeS8$, nukundamite $ceCu_3.39Fe_0.61S4$, haycockite $ceCu4Fe5S8$, mooihoekite $ceCu9Fe9S16$.
                      $endgroup$
                      – andselisk
                      Jan 26 at 20:05








                    2




                    2




                    $begingroup$
                    Here is some more: talnakhite $ceCu18Fe16S32$, valleriite $ceCu2Fe4S7$, fukuchilite $ceCu3FeS8$, nukundamite $ceCu_3.39Fe_0.61S4$, haycockite $ceCu4Fe5S8$, mooihoekite $ceCu9Fe9S16$.
                    $endgroup$
                    – andselisk
                    Jan 26 at 20:05





                    $begingroup$
                    Here is some more: talnakhite $ceCu18Fe16S32$, valleriite $ceCu2Fe4S7$, fukuchilite $ceCu3FeS8$, nukundamite $ceCu_3.39Fe_0.61S4$, haycockite $ceCu4Fe5S8$, mooihoekite $ceCu9Fe9S16$.
                    $endgroup$
                    – andselisk
                    Jan 26 at 20:05


















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