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Ammoniojarosite
A valid IMA mineral species - grandfathered
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About Ammoniojarosite
Formula:
(NH4)Fe3+3(SO4)2(OH)6
Colour:
Light yellow; light yellow to nearly colourless in transmitted light.
Lustre:
Waxy, Dull, Earthy
Hardness:
3½ - 4½
Specific Gravity:
3.112 (Calculated)
Crystal System:
Trigonal
Member of:
Name:
In allusion to its composition containing dominant AMMONIum, and its relationship to JAROSITE.
Type Locality:
Unique Identifiers
Mindat ID:
205
Long-form identifier:
mindat:1:1:205:9
IMA Classification of Ammoniojarosite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
N3-H4Fe3+3(S6+O4)2(OH)6
First published:
1927
Classification of Ammoniojarosite
7.BC.10
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
C : With medium-sized and large cations
30.2.5.4
30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
2 : (AB)2(XO4)Zq
30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
2 : (AB)2(XO4)Zq
25.11.14
25 : Sulphates
11 : Sulphates of Fe and other metals
25 : Sulphates
11 : Sulphates of Fe and other metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ajrs | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ammoniojarosite
Waxy, Dull, Earthy
Transparency:
Transparent, Translucent
Colour:
Light yellow; light yellow to nearly colourless in transmitted light.
Hardness:
3½ - 4½ on Mohs scale
Density:
3.112 g/cm3 (Calculated)
Optical Data of Ammoniojarosite
Type:
Uniaxial (-)
RI values:
nω = 1.8 nε = 1.75
Max. Birefringence:
δ = 0.050
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Ammoniojarosite
Mindat Formula:
(NH4)Fe3+3(SO4)2(OH)6
Element Weights:
Crystallography of Ammoniojarosite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 7.32 Å, c = 17.5 Å
Ratio:
a:c = 1 : 2.391
Unit Cell V:
812.07 ų (Calculated from Unit Cell)
Morphology:
Small lumps and irregular flattened nodules comprised of microscopic tabular grains with hexagonal outlines at times.
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) |
|---|---|---|---|---|---|---|---|
| 0014580 | Ammoniojarosite | Basciano L C, Peterson R C (2007) The crystal structure of ammoniojarosite, (NH4)Fe3(SO4)2(OH)6 and the crystal chemistry of the ammoniojarosite-hydronium jarosite solid-solution series Mineralogical Magazine 71 427-441 | 2007 | Synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.114 Å | (100) |
| 3.097 Å | (100) |
| 5.123 Å | (58) |
| 1.988 Å | (30) |
| 1.832 Å | (30) |
| 2.318 Å | (21) |
| 5.811 Å | (14) |
Comments:
Synthetic.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) | |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Ammoniojarosite
General Appearance of Type Material:
Small lumps and hard irregular flattened nodules up to 4 cm across by 5 mm thick embedded in blackish-brown lignitic material. With magnification, it is seen to form minute, transparent, pale-yellow, tabular grains including a few showing hexagonal outlines.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 95654.
Geological Setting of Type Material:
Formed in black lignitic shales containing pyrite.
Associated Minerals at Type Locality:
Synonyms of Ammoniojarosite
Other Language Names for Ammoniojarosite
Dutch:Ammoniojarosiet
French:Ammoniojarosite
German:Ammoniojarosit
Norwegian:Ammoniojarositt
Russian:Аммониоярозит
Spanish:Ammoniojarosita
Relationship of Ammoniojarosite to other Species
Member of:
Other Members of Alunite Group:
| Alunite | KAl3(SO4)2(OH)6 | Trig. 3m : R3m |
| Ammonioalunite | (NH4)Al3(SO4)2(OH)6 | Trig. |
| Argentojarosite | AgFe3+3(SO4)2(OH)6 | Trig. 3m : R3m |
| Beaverite-(Cu) | Pb(Fe3+2Cu)(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Beaverite-(Zn) | Pb(Fe3+2Zn)(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Dorallcharite | TlFe3+3(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Huangite | Ca0.5Al3(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Hydroniumjarosite | (H3O)Fe3+3(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Jarosite | KFe3+3(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Natroalunite | NaAl3(SO4)2(OH)6 | Trig. 3m : R3m |
| 'Natroalunite-2c' | (Na,Ca0.5,K)Al3(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Natrojarosite | NaFe3(SO4)2(OH)6 | Trig. 3m : R3m |
| Osarizawaite | Pb(Al2Cu2+)(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Plumbojarosite | Pb0.5Fe3+3(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Schlossmacherite | (H3O)Al3(SO4)2(OH)6 | Trig. 3m(32/m) : R3m |
| Walthierite | Ba0.5Al3(SO4)2(OH)6 | Trig. |
Common Associates
Associations Based on Photo Data:
| 3 photos of Ammoniojarosite associated with Gypsum | CaSO4 · 2H2O |
| 2 photos of Ammoniojarosite associated with Ammonioalunite | (NH4)Al3(SO4)2(OH)6 |
| 1 photo of Ammoniojarosite associated with Amurselite | (NH4)2(UO2)5(SeO3)3O2(OH)2(H2O) · 8H2O |
| 1 photo of Ammoniojarosite associated with Ammoniomagnesiovoltaite | (NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2O |
| 1 photo of Ammoniojarosite associated with Atacamite | Cu2(OH)3Cl |
| 1 photo of Ammoniojarosite associated with Kremersite | (NH4,K)2[Fe3+Cl5(H2O)] |
| 1 photo of Ammoniojarosite associated with Tschermigite | (NH4)Al(SO4)2 · 12H2O |
Related Minerals - Strunz-mindat Grouping
| 7.BC. | Viskontite | Pb5Cu2(SO4)3(SeO3)(OH)6 |
| 7.BC. | Zincochenite | Pb4Zn(SO4)2(OH)6 |
| 7.BC. | D'Ansite-(Mn) | Na21Mn2+(SO4)10Cl3 |
| 7.BC. | D'Ansite-(Fe) | Na21Fe2+(SO4)10Cl3 |
| 7.BC. | Acmonidesite | (NH4,K,Pb)8NaFe2+4(SO4)5Cl8 |
| 7.BC. | Adranosite | (NH4)4NaAl2(SO4)4Cl(OH)2 |
| 7.BC. | Chromviskontite | Pb5Cu2(CrO4)3(SeO3)(OH)6 |
| 7.BC. | Backite | Pb2AlTeO6Cl |
| 7.BC. | Adranosite-(Fe) | (NH4)4NaFe3+2(SO4)4Cl(OH)2 |
| 7.BC. | Agaite | Pb3CuTeO5(OH)2(CO3) |
| 7.BC. | Wildcatite | CaFe3+Te6+O5(OH) |
| 7.BC. | Hagstromite | Pb8Cu2+(Te6+O6)2(CO3)Cl4 |
| 7.BC.05 | D'Ansite | Na21Mg(SO4)10Cl3 |
| 7.BC.07 | 'Apatelite' | Fe3(SO4)2(OH)5 · 0.5H2O |
| 7.BC.07 | 'Unnamed (Ba-Fe Vanadate)' | Ba, Fe, V, O, H |
| 7.BC.10 | Jarosite | KFe3+3(SO4)2(OH)6 |
| 7.BC.10 | Dorallcharite | TlFe3+3(SO4)2(OH)6 |
| 7.BC.10 | Argentojarosite | AgFe3+3(SO4)2(OH)6 |
| 7.BC.10 | Natroalunite | NaAl3(SO4)2(OH)6 |
| 7.BC.10 | Natrojarosite | NaFe3(SO4)2(OH)6 |
| 7.BC.10 | Beaverite-(Cu) | Pb(Fe3+2Cu)(SO4)2(OH)6 |
| 7.BC.10 | Beaverite-(Zn) | Pb(Fe3+2Zn)(SO4)2(OH)6 |
| 7.BC.10 | Walthierite | Ba0.5Al3(SO4)2(OH)6 |
| 7.BC.10 | Huangite | Ca0.5Al3(SO4)2(OH)6 |
| 7.BC.10 | 'Natroalunite-2c' | (Na,Ca0.5,K)Al3(SO4)2(OH)6 |
| 7.BC.10 | Alunite | KAl3(SO4)2(OH)6 |
| 7.BC.10 | Plumbojarosite | Pb0.5Fe3+3(SO4)2(OH)6 |
| 7.BC.10 | Karlseifertite | Pb(Ga2Ge)(AsO4)2(OH)6 |
| 7.BC.10 | Hydroniumjarosite | (H3O)Fe3+3(SO4)2(OH)6 |
| 7.BC.10 | Ammonioalunite | (NH4)Al3(SO4)2(OH)6 |
| 7.BC.10 | Osarizawaite | Pb(Al2Cu2+)(SO4)2(OH)6 |
| 7.BC.10 | Schlossmacherite | (H3O)Al3(SO4)2(OH)6 |
| 7.BC.15 | Ye'elimite | Ca4Al6(SO4)O12 |
| 7.BC.20 | Nabokoite | KCu7(SO4)5(Te4+O3)OCl |
| 7.BC.20 | Puninite | Na2Cu3O(SO4)3 |
| 7.BC.20 | Atlasovite | K(BiO)Cu6Fe3+(SO4)5O3Cl |
| 7.BC.25 | Chlorothionite | K2Cu(SO4)Cl2 |
| 7.BC.30 | Euchlorine | KNaCu3(SO4)3O |
| 7.BC.30 | Fedotovite | K2Cu3(SO4)3O |
| 7.BC.35 | Kamchatkite | KCu3(SO4)2OCl |
| 7.BC.40 | Piypite | K4Cu4O2(SO4)4 · (Na,Cu)Cl |
| 7.BC.45 | Alumoklyuchevskite | K3Cu3(Al,Fe3+)(SO4)4O2 |
| 7.BC.45 | Belousovite | KZn(SO4)Cl |
| 7.BC.45 | Klyuchevskite | K3Cu3(Fe3+,Al)(SO4)4O2 |
| 7.BC.47 | Müllerite | Pb2Fe3+(Te6+O6)Cl |
| 7.BC.50 | Caledonite | Pb5Cu2(SO4)3(CO3)(OH)6 |
| 7.BC.50 | Elasmochloite | Na3Cu6BiO4(SO4)5 |
| 7.BC.52 | Eleomelanite | (K2Pb)Cu4O2(SO4)4 |
| 7.BC.55 | Falgarite | K4(VO)3(SO4)5 |
| 7.BC.55 | Wherryite | Pb7Cu2(SO4)4(SiO4)2(OH)2 |
| 7.BC.57 | Krasheninnikovite | KNa2CaMg(SO4)3F |
| 7.BC.60 | Wulffite | K3NaCu4O2(SO4)4 |
| 7.BC.60 | Parawulffite | K5Na3Cu8O4(SO4)8 |
| 7.BC.60 | Mammothite | Pb6Cu4AlSb5+O2(OH)16Cl4(SO4)2 |
| 7.BC.62 | Shuvalovite | K2(Ca2Na)(SO4)3F |
| 7.BC.65 | Saccoite | Ca2Mn3+2F(OH)8 · 0.5(SO4) |
| 7.BC.65 | Linarite | PbCu(SO4)(OH)2 |
| 7.BC.65 | Therasiaite | (NH4)3KNa2Fe2+Fe3+(SO4)3Cl5 |
| 7.BC.65 | Franksousaite | PbCu(Se6+O4)(OH)2 |
| 7.BC.65 |
Muttlkogel, Zangtal, Köflach - Voitsberg lignite deposit, Köflach, Voitsberg District, Styria, Austria