Picromerite Group
A group of related mineral species
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About Picromerite Group
Formula:
A2M(XO4)2 · 6H2O
A = K, Rb, Cs, NH4, Tl
M = Mg, Cu, Co, Zn, Mn, etc.;
X = S or Se.
M = Mg, Cu, Co, Zn, Mn, etc.;
X = S or Se.
Name:
After the principal species in the group, picromerite.
A group of isostructural compounds often referred to as "Tutton's salts".
Countless synthetic Tutton's salts are known.
Countless synthetic Tutton's salts are known.
Unique Identifiers
Mindat ID:
29323
Long-form identifier:
mindat:1:1:29323:5
Chemistry of Picromerite Group
Mindat Formula:
A2M(XO4)2 · 6H2O
A = K, Rb, Cs, NH4, Tl
M = Mg, Cu, Co, Zn, Mn, etc.;
X = S or Se.
A = K, Rb, Cs, NH4, Tl
M = Mg, Cu, Co, Zn, Mn, etc.;
X = S or Se.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0004776 | Picromerite | Bosi F, Belardi G, Ballirano P (2009) Structural features in Tutton's salts K2[M2+(H2O)6](SO4)2, with M2+= Mg, Fe, Co, Ni, Cu, and Zn American Mineralogist 94 74-82 |  | 2009 | synthetic | 0 | 293 |
| 0004780 | Cyanochroite | Bosi F, Belardi G, Ballirano P (2009) Structural features in Tutton's salts K2[M2+(H2O)6](SO4)2, with M2+= Mg, Fe, Co, Ni, Cu, and Zn American Mineralogist 94 74-82 | | 2009 | synthetic | 0 | 293 |
| 0010076 | Mohrite | Figgis B N, Kucharski E S, Reynolds P A, Tasset F (1989) The structure of (ND4)2Fe(SO4)2*6D2O at 4.3 K by neutron diffraction Acta Crystallographica C45 942-944 |  | 1989 | synthetic | 0 | 293 |
| 0015578 | Nickelboussingaultite | Treushnikov E N, Kuskov V I, Soboleva L V, Belov N V (1978) Distribution of electron density in nickel ammonium sulphate hexahydrate [Ni*6H2O](NH4)2(SO4)2 from x-ray diffraction data Soviet Physics Crystallography 23 30-41 | 1978 | synthetic | 0 | 293 | |
| 0012326 | Cyanochroite | Robinson D J, Kennard C H L (1972) Potassium hexa-aquacopper(II) sulfate, CuH12K2O14S2 (neutron) Crystal Structure Communications 1 185-188 | 1972 | synthetic | 0 | 293 | |
| 0019590 | Cyanochroite | Carapezza M, Di Sanseverino L R (1968) Crystallography and genesis of double sulfates and their hydrates. II. Structure, powder pattern and thermoanalysis of cyanochroite, K2Cu(SO4)2*6H2O Mineralogica Petrographica Acta 14 23-37 | 1968 | synthetic | 0 | 293 | |
| 0010626 | Picromerite | Kannan K K, Viswamitra M A (1965) Crystal structure of magnesium potassium sulfate hexahydrate MgK2(SO4)2*6(H2O) Zeitschrift fur Kristallographie 122 161-174 | | 1965 | synthetic | 0 | 293 |
| 0020239 | Nickelboussingaultite | Montgomery H, Lingafelter E C (1964) The crystal structure of Tutton's salts. II. Magnesium ammonium sulfate hexahydrate and nickel ammonium sulfate hexahydrate Acta Crystallographica 17 1478-1479 | | 1964 | synthetic | 0 | 293 |
| 0020241 | Boussingaultite | Montgomery H, Lingafelter E C (1964) The crystal structure of Tutton's salts. II. Magnesium ammonium sulfate hexahydrate and nickel ammonium sulfate hexahydrate Acta Crystallographica 17 1478-1479 | | 1964 | synthetic | 0 | 293 |
| 0010599 | Boussingaultite | Margulis T N, Templeton D H (1962) Crystal structure and hydrogen bonding of magnesium ammonium sulfate hexahydrate Zeitschrift fur Kristallographie 117 344-357 | | 1962 | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Picromerite Group to other Species
Picromerite Group Members:
| Boussingaultite | (NH4)2Mg(SO4)2 · 6H2O | Mon. 2/m : P21/b |
| Cyanochroite | K2Cu(SO4)2 · 6H2O | Mon. 2/m : P21/b |
| Katerinopoulosite | (NH4)2Zn(SO4)2 · 6H2O | Mon. 2/m : P21/b |
| Mohrite | (NH4)2Fe(SO4)2 · 6H2O | Mon. 2/m : P21/b |
| Nickelboussingaultite | (NH4)2Ni(SO4)2 · 6H2O | Mon. 2/m : P21/b |
| Nickelpicromerite | K2Ni(SO4)2 · 6H2O | Mon. 2/m : P21/b |
| Picromerite | K2Mg(SO4)2 · 6H2O | Mon. 2/m : P2/b |
Click on any node to view relationships. Formula-derived relationship network for the group members above. Use Find related species to add formula-neighbour species outside the current group view. Solid links show inferred chemical differences; dashed violet links show same-formula crystallographic differences. Hydration states are not treated as relationship changes. These relationships do not imply any real-world substitution reactions between these species.
Minerals structurally related to group:
| 'Konyaite' | Na2Mg(SO4)2 · 5H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Picromerite Group
mindat.org URL:
https://www.mindat.org/min-29323.html
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References for Picromerite Group
Reference List:
Hofmann, Wilhelm (1931) Die Struktur der Tuttonschen Salze. Zeitschrift für Kristallographie, Mineralogie und Petrographie, 78 (1-6). 279-333 doi:10.1524/zkri.1931.78.1.279
Hofmann, Wilhelm (1932) Nachtrag zu meiner Arbeit: »Die Struktur der Tuttonschen Salze«. Zeitschrift für Kristallographie, Mineralogie und Petrographie, 82 (1-6). 323-324 doi:10.1524/zkri.1932.82.1.323
Localities for Picromerite Group
Showing 143 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Pécs-Vasas, Pécs District, Baranya County, Hungary