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.
inorganic-chemistry notation metallurgy
edited Jan 26 at 19:43
andselisk
16.1k653114
asked Jan 26 at 18:45
MrAPMrAP
29721034
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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 $ceCu2S.Fe2S3$ 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
edited Jan 26 at 19:43
andselisk
16.1k653114
asked Jan 26 at 18:45
MrAPMrAP
29721034
$endgroup$
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 $ceCu2S.Fe2S3$ 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
edited Jan 26 at 19:43
andselisk
16.1k653114
asked Jan 26 at 18:45
MrAPMrAP
29721034
$endgroup$
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
inorganic-chemistry notation metallurgy
edited Jan 26 at 19:43
andselisk
16.1k653114
asked Jan 26 at 18:45
MrAPMrAP
29721034
edited Jan 26 at 19:43
andselisk
16.1k653114
asked Jan 26 at 18:45
MrAPMrAP
29721034
edited Jan 26 at 19:43
andselisk
16.1k653114
edited Jan 26 at 19:43
andselisk
16.1k653114
edited Jan 26 at 19:43
andselisk
16.1k653114
16.1k653114
asked Jan 26 at 18:45
MrAPMrAP
29721034
asked Jan 26 at 18:45
MrAPMrAP
29721034
asked Jan 26 at 18:45
MrAPMrAP
29721034
29721034
add a comment |
add a comment |
2 Answers
2
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oldest
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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.
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.
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
- 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.
answered Jan 26 at 19:40
andseliskandselisk
16.1k653114
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add a comment |
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I know of five copper iron sulfide minerals:
Bornite - $ceCu5FeS4$
Chalcopyrite - $ceCuFeS2$
Cubanite - $ceCuFe2S3$
Idaite - $ceCu5FeS6$
Isocubanite - $ceCuFe2S3$
answered Jan 26 at 19:10
MaxWMaxW
14.7k12158
$endgroup$
2
$begingroup$
Here is some more: talnakhite $ceCu18Fe16S32$, valleriite $ceCu2Fe4S7$, fukuchilite $ceCu3FeS8$, nukundamite $ceCu_3.39Fe_0.61S4$, haycockite $ceCu4Fe5S8$, mooihoekite $ceCu9Fe9S16$.
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– andselisk
Jan 26 at 20:05
add a comment |
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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.
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.
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
- 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.
answered Jan 26 at 19:40
andseliskandselisk
16.1k653114
$endgroup$
add a comment |
$begingroup$
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.
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.
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
- 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.
answered Jan 26 at 19:40
andseliskandselisk
16.1k653114
$endgroup$
add a comment |
$begingroup$
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.
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.
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
- 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.
answered Jan 26 at 19:40
andseliskandselisk
16.1k653114
$endgroup$
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.
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.
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
- 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.
answered Jan 26 at 19:40
andseliskandselisk
16.1k653114
edited Jan 26 at 19:57
answered Jan 26 at 19:40
andseliskandselisk
16.1k653114
answered Jan 26 at 19:40
andseliskandselisk
16.1k653114
answered Jan 26 at 19:40
andseliskandselisk
16.1k653114
16.1k653114
add a comment |
add a comment |
$begingroup$
I know of five copper iron sulfide minerals:
Bornite - $ceCu5FeS4$
Chalcopyrite - $ceCuFeS2$
Cubanite - $ceCuFe2S3$
Idaite - $ceCu5FeS6$
Isocubanite - $ceCuFe2S3$
answered Jan 26 at 19:10
MaxWMaxW
14.7k12158
$endgroup$
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
add a comment |
$begingroup$
I know of five copper iron sulfide minerals:
Bornite - $ceCu5FeS4$
Chalcopyrite - $ceCuFeS2$
Cubanite - $ceCuFe2S3$
Idaite - $ceCu5FeS6$
Isocubanite - $ceCuFe2S3$
answered Jan 26 at 19:10
MaxWMaxW
14.7k12158
$endgroup$
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
add a comment |
$begingroup$
I know of five copper iron sulfide minerals:
Bornite - $ceCu5FeS4$
Chalcopyrite - $ceCuFeS2$
Cubanite - $ceCuFe2S3$
Idaite - $ceCu5FeS6$
Isocubanite - $ceCuFe2S3$
answered Jan 26 at 19:10
MaxWMaxW
14.7k12158
$endgroup$
I know of five copper iron sulfide minerals:
Bornite - $ceCu5FeS4$
Chalcopyrite - $ceCuFeS2$
Cubanite - $ceCuFe2S3$
Idaite - $ceCu5FeS6$
Isocubanite - $ceCuFe2S3$
answered Jan 26 at 19:10
MaxWMaxW
14.7k12158
answered Jan 26 at 19:10
MaxWMaxW
14.7k12158
answered Jan 26 at 19:10
MaxWMaxW
14.7k12158
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
add a comment |
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
add a comment |
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