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 $ce{Cu2S.Fe2S3}$ at one place, $ce{CuFeS2}$ at another place and $ce{Cu2FeS2}$ 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
edited 1 hour ago
andselisk
15k649108
asked 2 hours ago
MrAPMrAP
2732934
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add a comment |
$begingroup$
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 $ce{Cu2S.Fe2S3}$ at one place, $ce{CuFeS2}$ at another place and $ce{Cu2FeS2}$ 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
edited 1 hour ago
andselisk
15k649108
asked 2 hours ago
MrAPMrAP
2732934
$endgroup$
add a comment |
$begingroup$
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 $ce{Cu2S.Fe2S3}$ at one place, $ce{CuFeS2}$ at another place and $ce{Cu2FeS2}$ 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
edited 1 hour ago
andselisk
15k649108
asked 2 hours ago
MrAPMrAP
2732934
$endgroup$
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 $ce{Cu2S.Fe2S3}$ at one place, $ce{CuFeS2}$ at another place and $ce{Cu2FeS2}$ 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
inorganic-chemistry notation metallurgy
edited 1 hour ago
andselisk
15k649108
asked 2 hours ago
MrAPMrAP
2732934
edited 1 hour ago
andselisk
15k649108
asked 2 hours ago
MrAPMrAP
2732934
edited 1 hour ago
andselisk
15k649108
edited 1 hour ago
andselisk
15k649108
edited 1 hour ago
andselisk
15k649108
15k649108
asked 2 hours ago
MrAPMrAP
2732934
asked 2 hours ago
MrAPMrAP
2732934
asked 2 hours ago
MrAPMrAP
2732934
2732934
add a comment |
add a comment |
2 Answers
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Both $ce{Cu2S.Fe2S3}$ and $ce{CuFeS2}$ are the equivalent means to denote chalcopyrite. The first notation, $ce{Cu2S.Fe2S3}$, 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. $ce{CuSO4 * 5 H2O}$). The second one, $ce{CuFeS2}$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ce{ABX2}$ type, crystallizes in $Ibar{4}2d$ space group.
Figure 1. Unit cell of chalcopyrite $ce{CuFeS2}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
On the other hand, $ce{Cu2FeS2}$ is a reduced formula of $ce{Cu8Fe4S8}$, a superstructured bornite [1]. A compound of $ce{AB2X2}$ type, crystallizes in $Fbar{4}3m$ space group.
Figure 2. Unit cell of superstructured bornite $ce{Cu8Fe4S8}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ce{Cu2FeS2}$ 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
- Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ce{Fe/Cu}$ Ordering Schemes in the 2a Superstructure of Bornite ($ce{Cu5FeS4}$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.
answered 1 hour ago
andseliskandselisk
15k649108
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add a comment |
$begingroup$
I know of five copper iron sulfide minerals:
Bornite - $ce{Cu5FeS4}$
Chalcopyrite - $ce{CuFeS2}$
Cubanite - $ce{CuFe2S3}$
Idaite - $ce{Cu5FeS6}$
Isocubanite - $ce{CuFe2S3}$
answered 1 hour ago
MaxWMaxW
14.6k12158
$endgroup$
$begingroup$
Here is some more: talnakhite $ce{Cu18Fe16S32}$, valleriite $ce{Cu2Fe4S7}$, fukuchilite $ce{Cu3FeS8}$, nukundamite $ce{Cu_{3.39}Fe_{0.61}S4}$, haycockite $ce{Cu4Fe5S8}$, mooihoekite $ce{Cu9Fe9S16}$.
$endgroup$
– andselisk
48 mins ago
add a comment |
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2 Answers
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$begingroup$
Both $ce{Cu2S.Fe2S3}$ and $ce{CuFeS2}$ are the equivalent means to denote chalcopyrite. The first notation, $ce{Cu2S.Fe2S3}$, 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. $ce{CuSO4 * 5 H2O}$). The second one, $ce{CuFeS2}$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ce{ABX2}$ type, crystallizes in $Ibar{4}2d$ space group.
Figure 1. Unit cell of chalcopyrite $ce{CuFeS2}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
On the other hand, $ce{Cu2FeS2}$ is a reduced formula of $ce{Cu8Fe4S8}$, a superstructured bornite [1]. A compound of $ce{AB2X2}$ type, crystallizes in $Fbar{4}3m$ space group.
Figure 2. Unit cell of superstructured bornite $ce{Cu8Fe4S8}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ce{Cu2FeS2}$ 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
- Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ce{Fe/Cu}$ Ordering Schemes in the 2a Superstructure of Bornite ($ce{Cu5FeS4}$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.
answered 1 hour ago
andseliskandselisk
15k649108
$endgroup$
add a comment |
$begingroup$
Both $ce{Cu2S.Fe2S3}$ and $ce{CuFeS2}$ are the equivalent means to denote chalcopyrite. The first notation, $ce{Cu2S.Fe2S3}$, 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. $ce{CuSO4 * 5 H2O}$). The second one, $ce{CuFeS2}$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ce{ABX2}$ type, crystallizes in $Ibar{4}2d$ space group.
Figure 1. Unit cell of chalcopyrite $ce{CuFeS2}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
On the other hand, $ce{Cu2FeS2}$ is a reduced formula of $ce{Cu8Fe4S8}$, a superstructured bornite [1]. A compound of $ce{AB2X2}$ type, crystallizes in $Fbar{4}3m$ space group.
Figure 2. Unit cell of superstructured bornite $ce{Cu8Fe4S8}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ce{Cu2FeS2}$ 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
- Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ce{Fe/Cu}$ Ordering Schemes in the 2a Superstructure of Bornite ($ce{Cu5FeS4}$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.
answered 1 hour ago
andseliskandselisk
15k649108
$endgroup$
add a comment |
$begingroup$
Both $ce{Cu2S.Fe2S3}$ and $ce{CuFeS2}$ are the equivalent means to denote chalcopyrite. The first notation, $ce{Cu2S.Fe2S3}$, 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. $ce{CuSO4 * 5 H2O}$). The second one, $ce{CuFeS2}$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ce{ABX2}$ type, crystallizes in $Ibar{4}2d$ space group.
Figure 1. Unit cell of chalcopyrite $ce{CuFeS2}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
On the other hand, $ce{Cu2FeS2}$ is a reduced formula of $ce{Cu8Fe4S8}$, a superstructured bornite [1]. A compound of $ce{AB2X2}$ type, crystallizes in $Fbar{4}3m$ space group.
Figure 2. Unit cell of superstructured bornite $ce{Cu8Fe4S8}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ce{Cu2FeS2}$ 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
- Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ce{Fe/Cu}$ Ordering Schemes in the 2a Superstructure of Bornite ($ce{Cu5FeS4}$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.
answered 1 hour ago
andseliskandselisk
15k649108
$endgroup$
Both $ce{Cu2S.Fe2S3}$ and $ce{CuFeS2}$ are the equivalent means to denote chalcopyrite. The first notation, $ce{Cu2S.Fe2S3}$, 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. $ce{CuSO4 * 5 H2O}$). The second one, $ce{CuFeS2}$, is a formula unit, a more universal and modern representation. Chalcopyrite is a mineral of $ce{ABX2}$ type, crystallizes in $Ibar{4}2d$ space group.
Figure 1. Unit cell of chalcopyrite $ce{CuFeS2}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
On the other hand, $ce{Cu2FeS2}$ is a reduced formula of $ce{Cu8Fe4S8}$, a superstructured bornite [1]. A compound of $ce{AB2X2}$ type, crystallizes in $Fbar{4}3m$ space group.
Figure 2. Unit cell of superstructured bornite $ce{Cu8Fe4S8}$. Color code: $color{#FFFF30}{Largebullet}~ce{S}$; $color{#E06633}{Largebullet}~ce{Fe}$; $color{#C88033}{Largebullet}~ce{Cu}$.
Structurally, chalcopyrite and superstructured bornite have very little in common. Unless there is a specific context given, I'd rather say that $ce{Cu2FeS2}$ 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
- Ding, Y.; Veblen, D. R.; Prewitt, C. T. Possible $ce{Fe/Cu}$ Ordering Schemes in the 2a Superstructure of Bornite ($ce{Cu5FeS4}$). American Mineralogist 2005, 90 (8–9), 1265–1269. https://doi.org/10.2138/am.2005.1518.
answered 1 hour ago
andseliskandselisk
15k649108
edited 56 mins ago
answered 1 hour ago
andseliskandselisk
15k649108
answered 1 hour ago
andseliskandselisk
15k649108
answered 1 hour ago
andseliskandselisk
15k649108
15k649108
add a comment |
add a comment |
$begingroup$
I know of five copper iron sulfide minerals:
Bornite - $ce{Cu5FeS4}$
Chalcopyrite - $ce{CuFeS2}$
Cubanite - $ce{CuFe2S3}$
Idaite - $ce{Cu5FeS6}$
Isocubanite - $ce{CuFe2S3}$
answered 1 hour ago
MaxWMaxW
14.6k12158
$endgroup$
$begingroup$
Here is some more: talnakhite $ce{Cu18Fe16S32}$, valleriite $ce{Cu2Fe4S7}$, fukuchilite $ce{Cu3FeS8}$, nukundamite $ce{Cu_{3.39}Fe_{0.61}S4}$, haycockite $ce{Cu4Fe5S8}$, mooihoekite $ce{Cu9Fe9S16}$.
$endgroup$
– andselisk
48 mins ago
add a comment |
$begingroup$
I know of five copper iron sulfide minerals:
Bornite - $ce{Cu5FeS4}$
Chalcopyrite - $ce{CuFeS2}$
Cubanite - $ce{CuFe2S3}$
Idaite - $ce{Cu5FeS6}$
Isocubanite - $ce{CuFe2S3}$
answered 1 hour ago
MaxWMaxW
14.6k12158
$endgroup$
$begingroup$
Here is some more: talnakhite $ce{Cu18Fe16S32}$, valleriite $ce{Cu2Fe4S7}$, fukuchilite $ce{Cu3FeS8}$, nukundamite $ce{Cu_{3.39}Fe_{0.61}S4}$, haycockite $ce{Cu4Fe5S8}$, mooihoekite $ce{Cu9Fe9S16}$.
$endgroup$
– andselisk
48 mins ago
add a comment |
$begingroup$
I know of five copper iron sulfide minerals:
Bornite - $ce{Cu5FeS4}$
Chalcopyrite - $ce{CuFeS2}$
Cubanite - $ce{CuFe2S3}$
Idaite - $ce{Cu5FeS6}$
Isocubanite - $ce{CuFe2S3}$
answered 1 hour ago
MaxWMaxW
14.6k12158
$endgroup$
I know of five copper iron sulfide minerals:
Bornite - $ce{Cu5FeS4}$
Chalcopyrite - $ce{CuFeS2}$
Cubanite - $ce{CuFe2S3}$
Idaite - $ce{Cu5FeS6}$
Isocubanite - $ce{CuFe2S3}$
answered 1 hour ago
MaxWMaxW
14.6k12158
answered 1 hour ago
MaxWMaxW
14.6k12158
answered 1 hour ago
MaxWMaxW
14.6k12158
answered 1 hour ago
MaxWMaxW
14.6k12158
14.6k12158
$begingroup$
Here is some more: talnakhite $ce{Cu18Fe16S32}$, valleriite $ce{Cu2Fe4S7}$, fukuchilite $ce{Cu3FeS8}$, nukundamite $ce{Cu_{3.39}Fe_{0.61}S4}$, haycockite $ce{Cu4Fe5S8}$, mooihoekite $ce{Cu9Fe9S16}$.
$endgroup$
– andselisk
48 mins ago
add a comment |
$begingroup$
Here is some more: talnakhite $ce{Cu18Fe16S32}$, valleriite $ce{Cu2Fe4S7}$, fukuchilite $ce{Cu3FeS8}$, nukundamite $ce{Cu_{3.39}Fe_{0.61}S4}$, haycockite $ce{Cu4Fe5S8}$, mooihoekite $ce{Cu9Fe9S16}$.
$endgroup$
– andselisk
48 mins ago
$begingroup$
Here is some more: talnakhite $ce{Cu18Fe16S32}$, valleriite $ce{Cu2Fe4S7}$, fukuchilite $ce{Cu3FeS8}$, nukundamite $ce{Cu_{3.39}Fe_{0.61}S4}$, haycockite $ce{Cu4Fe5S8}$, mooihoekite $ce{Cu9Fe9S16}$.
$endgroup$
– andselisk
48 mins ago
$begingroup$
Here is some more: talnakhite $ce{Cu18Fe16S32}$, valleriite $ce{Cu2Fe4S7}$, fukuchilite $ce{Cu3FeS8}$, nukundamite $ce{Cu_{3.39}Fe_{0.61}S4}$, haycockite $ce{Cu4Fe5S8}$, mooihoekite $ce{Cu9Fe9S16}$.
$endgroup$
– andselisk
48 mins ago
add a comment |
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