Jarosite
About Jarosite

Jaroso Ravine, Sierra Almagrera, Cuevas del Almanzora, Almería, Andalusia, Spain
The Fe(III) analogue of alunite. Visually indistinguishable from natrojarosite and other members of the jarosite group.
Usually found as amber-yellow to brown crusts or coatings of minute crystals, larger crystals rather rare.
Desborough et al. (2010) showed there is only limited solid solution between jarosite and natrojarosite at low temperatures.
Synthetic samples may be monoclinic-pseudorhombohedral (Grey et al., 2010, 2013).
Mo-bearing jarosite was described by Žáček et al. (2008).
Jarosite has been used for dating (K-Ar method) of weathering processes.
Some jarosites may be a sink of the toxic metal thallium.
Unique Identifiers
Similar Names
| Janosite | A synonym of Copiapite | |
| Jarošit | A synonym of 'Kirovite' | |
| Larosite | A valid IMA mineral species | (Cu,Ag)21PbBiS13 |
| Marosite (of Cook and Sherwood) | A rock subtype | |
| Marosite (of Iddings) | A rock subtype |
IMA Classification of Jarosite
Classification of Jarosite
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
C : With medium-sized and large cations
30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
2 : (AB)2(XO4)Zq
25 : Sulphates
11 : Sulphates of Fe and other metals
Mineral Symbols
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Jrs | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Jrs | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
| Jrs | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
| Jrs | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Pronunciation of Jarosite
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Jarosite
Distinct on {0001}.
Optical Data of Jarosite
Based on recorded range of RI values above.
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.
Relative to Canada balsam mounting medium (n ≈ 1.537).
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.
(Y) = Reddish brown
Ο (Z) = Reddish brown
Chemistry of Jarosite
Chemical Analysis
| 1 | |
|---|---|
| H2O- | 3.64 % |
| H2O+ | 5.49 % |
| Fe2O3 | 11.50 % |
| CaO | 0.42 % |
| Na2O | 0.50 % |
| K2O | 0.58 % |
| SO3 | 10.15 % |
| Residue | 67.63 % |
| Total: | 99.91 % |
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Eisden colliery, Eisden, Maasmechelen, Limburg, Flanders, Belgium | Analysis by Van Tassel & Van Stiphoudt |
Crystallography of Jarosite
Crystal Structure
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020094 | Jarosite | Mills S J, Nestola F, Kahlenberg V, Christy A G, Hejny C, Redhammer G J (2013) Looking for jarosite on Mars: The low-temperature crystal structure of jarosite American Mineralogist 98 1966-1971 | 2013 | Jaroso Ravine, Sierra Almagrera, Andalusia, Almeria, Spain | 0 | 297 | |
| 0004573 | Jarosite | Basciano L C, Peterson R C (2008) Crystal chemistry of the natrojarosite-jarosite and natrojarosite-hydronium jarosite solid-solution: A synthetic study with full Fe site occupancy American Mineralogist 93 853-862 | ![]() | 2008 | synthetic | 0 | 293 |
| 0004572 | Jarosite | Basciano L C, Peterson R C (2008) Crystal chemistry of the natrojarosite-jarosite and natrojarosite-hydronium jarosite solid-solution: A synthetic study with full Fe site occupancy American Mineralogist 93 853-862 | ![]() | 2008 | synthetic | 0 | 293 |
| 0004571 | Jarosite | Basciano L C, Peterson R C (2008) Crystal chemistry of the natrojarosite-jarosite and natrojarosite-hydronium jarosite solid-solution: A synthetic study with full Fe site occupancy American Mineralogist 93 853-862 | ![]() | 2008 | synthetic | 0 | 293 |
| 0004440 | Jarosite | Basciano L C, Peterson R C (2007) Jarosite - hydronium jarosite solid solution series with full iron occupancy: Mineralogy and crystal chemistry American Mineralogist 92 1464-1473 | ![]() | 2007 | Rio Tonto, Huelva, Spain | 0 | 293 |
| 0004439 | Jarosite | Basciano L C, Peterson R C (2007) Jarosite - hydronium jarosite solid solution series with full iron occupancy: Mineralogy and crystal chemistry American Mineralogist 92 1464-1473 | ![]() | 2007 | Rio Tonto, Huelva, Spain | 0 | 293 |
| 0004438 | Jarosite | Basciano L C, Peterson R C (2007) Jarosite - hydronium jarosite solid solution series with full iron occupancy: Mineralogy and crystal chemistry American Mineralogist 92 1464-1473 | ![]() | 2007 | synthetic | 0 | 293 |
| 0004437 | Jarosite | Basciano L C, Peterson R C (2007) Jarosite - hydronium jarosite solid solution series with full iron occupancy: Mineralogy and crystal chemistry American Mineralogist 92 1464-1473 | ![]() | 2007 | synthetic | 0 | 293 |
| 0004436 | Jarosite | Basciano L C, Peterson R C (2007) Jarosite - hydronium jarosite solid solution series with full iron occupancy: Mineralogy and crystal chemistry American Mineralogist 92 1464-1473 | ![]() | 2007 | synthetic | 0 | 293 |
| 0004435 | Jarosite | Basciano L C, Peterson R C (2007) Jarosite - hydronium jarosite solid solution series with full iron occupancy: Mineralogy and crystal chemistry American Mineralogist 92 1464-1473 | ![]() | 2007 | synthetic | 0 | 293 |
| 0004434 | Jarosite | Basciano L C, Peterson R C (2007) Jarosite - hydronium jarosite solid solution series with full iron occupancy: Mineralogy and crystal chemistry American Mineralogist 92 1464-1473 | ![]() | 2007 | synthetic | 0 | 293 |
| 0004433 | Jarosite | Basciano L C, Peterson R C (2007) Jarosite - hydronium jarosite solid solution series with full iron occupancy: Mineralogy and crystal chemistry American Mineralogist 92 1464-1473 | ![]() | 2007 | synthetic | 0 | 293 |
| 0014420 | Jarosite | Kato T, Miura Y (1977) The crystal structure of jarosite and svanbergite Mineralogical Journal 8 419-430 | ![]() | 1977 | Meadow Valley 1, Pinoche, Nevada, USA | 0 | 293 |
| 0014756 | Jarosite | Menchetti S, Sabelli C (1976) Crystal chemistry of the alunite series: crystal structure refinement of alunite and synthetic jarosite Neues Jahrbuch fur Mineralogie, Monatshefte 1976 406-417 | 1976 | synthetic | 0 | 293 | |
| 0020095 | Jarosite | Mills S J, Nestola F, Kahlenberg V, Christy A G, Hejny C, Redhammer G J (2013) Looking for jarosite on Mars: The low-temperature crystal structure of jarosite American Mineralogist 98 1966-1971 | 2013 | Jaroso Ravine, Sierra Almagrera, Andalusia, Almeria, Spain | 0 | 253 | |
| 0017748 | Jarosite | Scarlett N V Y, Grey I E, Brand H E A (2010) Ordering of iron vacancies in monoclinic jarosites American Mineralogist 95 1590-1593 | ![]() | 2010 | synthetic | 0 | 368 |
| 0020096 | Jarosite | Mills S J, Nestola F, Kahlenberg V, Christy A G, Hejny C, Redhammer G J (2013) Looking for jarosite on Mars: The low-temperature crystal structure of jarosite American Mineralogist 98 1966-1971 | 2013 | Jaroso Ravine, Sierra Almagrera, Andalusia, Almeria, Spain | 0 | 213 | |
| 0020097 | Jarosite | Mills S J, Nestola F, Kahlenberg V, Christy A G, Hejny C, Redhammer G J (2013) Looking for jarosite on Mars: The low-temperature crystal structure of jarosite American Mineralogist 98 1966-1971 | 2013 | Jaroso Ravine, Sierra Almagrera, Andalusia, Almeria, Spain | 0 | 173 | |
| 0020098 | Jarosite | Mills S J, Nestola F, Kahlenberg V, Christy A G, Hejny C, Redhammer G J (2013) Looking for jarosite on Mars: The low-temperature crystal structure of jarosite American Mineralogist 98 1966-1971 | 2013 | Jaroso Ravine, Sierra Almagrera, Andalusia, Almeria, Spain | 0 | 133 | |
| 0008600 | Jarosite | Becker U, Gasharova B (2001) AFM observations and simulations of jarosite growth at the molecular scale: probing the basis for the incorporation of foreign ions into jarosite as a storage mineral Physics and Chemistry of Minerals 28 545-556 | 2001 | 0 | 293 |
X-Ray Powder Diffraction
| d-spacing | Intensity |
|---|---|
| 5.93 Å | (50) |
| 5.09 Å | (70) |
| 3.65 Å | (40) |
| 3.11 Å | (80) |
| 3.08 Å | (100) |
| 2.29 Å | (40) |
| 1.98 Å | (50) |
| 1.83 Å | (50) |
Geological Environment
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 46 : Near-surface hydrothermal alteration of minerals (see also #22) | |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 49 : Oxic cellular biomineralization (see also #44) | <0.54 |
Type Occurrence of Jarosite
Synonyms of Jarosite
Other Language Names for Jarosite
Varieties of Jarosite
| Calcium-Jarosite | Probably an impure Jarosite |
| Kolosorukite | A variety of Jarosite low in Fe3+ (possibly with a hydronium jarosite or natrojarosite component). Originally described from Korozluky (Kolosoruk), Most, Ústí Region, Bohemia (Böhmen; Boehmen), Czech Republic. |
Relationship of Jarosite to other Species
| Alunite | KAl3(SO4)2(OH)6 | Trig. 3m : R3m |
| Ammonioalunite | (NH4)Al3(SO4)2(OH)6 | Trig. |
| Ammoniojarosite | (NH4)Fe3+3(SO4)2(OH)6 | Trig. 3m : R3m |
| 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 |
| 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
| 204 photos of Jarosite associated with Quartz | SiO2 |
| 99 photos of Jarosite associated with Goethite | Fe3+O(OH) |
| 56 photos of Jarosite associated with Hematite | Fe2O3 |
| 54 photos of Jarosite associated with Gypsum | CaSO4 · 2H2O |
| 51 photos of Jarosite associated with Natrojarosite | NaFe3(SO4)2(OH)6 |
| 47 photos of Jarosite associated with Rodalquilarite | Fe2(TeO2OH)3(TeO3)Cl |
| 47 photos of Jarosite associated with Scorodite | Fe3+AsO4 · 2H2O |
| 26 photos of Jarosite associated with Pharmacosiderite | KFe3+4(AsO4)3(OH)4 · 6-7H2O |
| 24 photos of Jarosite associated with Winstanleyite | TiTe4+3O8 |
| 24 photos of Jarosite associated with Native Gold | Au |
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 | 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 | Ammoniojarosite | (NH4)Fe3+3(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 | Munakataite | Pb2Cu2(Se4+O3)(SO4)(OH)4 |
| 7.BC.65 | Schmiederite | Pb2Cu2(Se6+O4)(Se4+O3)(OH)4 |
| 7.BC.70 | Chenite | Pb4Cu(SO4)2(OH)6 |
| 7.BC.75 | Krivovichevite | Pb3Al(OH)6(SO4)(OH) |
| 7.BC.80 | Anhydrokainite | KMg(SO4)Cl |
Radioactivity
| Element | % Content | Activity (Bq/kg) | Radiation Type |
|---|---|---|---|
| Uranium (U) | 0.0000% | 0 | α, β, γ |
| Thorium (Th) | 0.0000% | 0 | α, β, γ |
| Potassium (K) | 7.8071% | 2,420 | β, γ |
For comparison:
- Banana: ~15 Bq per fruit
- Granite: 1,000–3,000 Bq/kg
- EU exemption limit: 10,000 Bq/kg
Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.
Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!
Activity: –
| Distance | Dose rate | Risk |
|---|---|---|
| 1 cm | ||
| 10 cm | ||
| 1 m |
The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).
D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield
Other Information
Internet Links for Jarosite
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References for Jarosite
Localities for Jarosite
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La Estrella mine, Jaroso Ravine, Sierra Almagrera, Cuevas del Almanzora, Almería, Andalusia, Spain