Schwertmannite
A valid IMA mineral species
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About Schwertmannite
Udo Schwertmann
Formula:
Fe3+16(OH,SO4)12-13O16 · 10-12H2O
Colour:
Brownish yellow
Lustre:
Earthy
Hardness:
1 - 2
Specific Gravity:
3.88 (Calculated)
Crystal System:
Tetragonal
Name:
Originally named glockerite in 1855 by Karl Friedrich Naumann in honour of Ernst Friedrich Glocker (1 May 1783 Stuttgart, Germany - 18 July 1858), professor of mineralogy at University of Breslau (University of Vratislav; Wroclaw, Poland) and author of numerous systematic mineralogical works. Renamed by J.M. Bigham, L. Carlson, E. Murad, in 1994 in honour of Udo Schwertmann (25 November 1927,Stade/Elbe, Germany - 20 January 2016), soil scientist at the University of München (Munich), Germany. He made "numerous contributions to the crystal chemistry of iron oxides and oxyhydroxides and has greatly advanced our knowledge of poorly crystalline phases that are common to weathering environments."
Type Locality:
This page provides mineralogical data about Schwertmannite.
Unique Identifiers
Mindat ID:
7281
Long-form identifier:
mindat:1:1:7281:2
GUID
(UUID V4):
(UUID V4):
3d20a288-ca66-4231-b95b-7b1a105e46db
IMA Classification of Schwertmannite
Approved
IMA Formula:
Fe3+16O16(OH)9.6(SO4)3.2 · 10H2O
Approval year:
1990
First published:
1994
Classification of Schwertmannite
7.DE.15
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
6.4.10.1
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
4 : Miscellaneous
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
4 : Miscellaneous
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Swm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Sch | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
| Swm | 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 |
Physical Properties of Schwertmannite
Earthy
Transparency:
Opaque
Colour:
Brownish yellow
Streak:
Yellow
Hardness:
1 - 2 on Mohs scale
Density:
3.88(11) g/cm3 (Calculated)
Chemistry of Schwertmannite
Mindat Formula:
Fe3+16(OH,SO4)12-13O16 · 10-12H2O
Elements listed:
Crystallography of Schwertmannite
Crystal System:
Tetragonal
Cell Parameters:
a = 10.66 Å, c = 6.04 Å
Ratio:
a:c = 1 : 0.567
Unit Cell V:
686.36 ų (Calculated from Unit Cell)
Morphology:
Tiny (2-4 nm thick, 60-90 nm long), fibrous crystals arranged in the form of pin-cushion-like aggregates.
Comment:
Poorly crystalline
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) |
|---|---|---|---|---|---|---|---|
| 0018670 | Schwertmannite | Fernandez-Martinez A, Timon V, Roman-Ross G, Cuello G J, Daniels J E, Ayora C (2010) The structure of schwertmannite, a nanocrystalline iron oxyhydroxysulfate American Mineralogist 95 1312-1322 |  | 2010 | Monte Romero mine (Iberian Pyrite Belt), Spain | 0 | 293 |
| 0018671 | Schwertmannite | Fernandez-Martinez A, Timon V, Roman-Ross G, Cuello G J, Daniels J E, Ayora C (2010) The structure of schwertmannite, a nanocrystalline iron oxyhydroxysulfate American Mineralogist 95 1312-1322 | | 2010 | Monte Romero mine (Iberian Pyrite Belt), Spain | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.86 Å | (37) |
| 3.39 Å | (46) |
| 2.55 Å | (100) |
| 2.28 Å | (23) |
| 1.66 Å | (21) |
| 1.51 Å | (24) |
| 1.46 Å | (18) |
Comments:
Broad peaks
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 2: Planetesimal differentiation and alteration | 4.566-4.550 |
| 6 : Secondary asteroid phases | 4.566-4.560 |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47h : [Near-surface oxidized, dehydrated minerals] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 49 : Oxic cellular biomineralization (see also #44) | <0.54 |
Type Occurrence of Schwertmannite
General Appearance of Type Material:
Ochreous. Poorly crystalline, yellowish brown, with a fibrous morphology under the electron microscope.
Place of Conservation of Type Material:
Museum of Natural History, University of Helsinki, Helsinki, Finland, B8659.
Geological Setting of Type Material:
Precipitate from acid, sulphate-rich waters.
Associated Minerals at Type Locality:
Reference:
Bigham, J. M., Carlson, L., Murad, E. (1994) Schwertmannite, a new iron oxyhydroxysulfate from Pyhasalmi, Finland, and other localities. Mineralogical Magazine: 58: 641-664.
Synonyms of Schwertmannite
Other Language Names for Schwertmannite
German:Schwertmannit
Spanish:Schwertmannita
Related Minerals - Strunz-mindat Grouping
| 7.DE. | Cossaite | (Mg0.5,◻)Al6(SO4)6(HSO4)F6 · 36H2O |
| 7.DE. | Magnesioalterite | Mg2Fe3+4(SO4)4(C2O4)2(OH)4 · 17H2O |
| 7.DE. | Liangjunite | K2(Mo2O5)(SO4)2 · 3H2O |
| 7.DE. | Fabritzite | Zn9(SO4)2(OH)12Cl2 · 6H2O |
| 7.DE. | Downsite | K2(MoO3)3(SO4) · 4H2O |
| 7.DE.05 | Mangazeite | Al2(SO4)(OH)4 · 3H2O |
| 7.DE.10 | Carbonatecyanotrichite | Cu4Al2(CO3,SO4)(OH)12 · 2H2O |
| 7.DE.10 | Cyanotrichite | Cu4Al2(SO4)(OH)12 · 2H2O |
| 7.DE.10 | UKI-1975-(SO:AlCu) | (Cu, Al, SO4, H2O) |
| 7.DE.20 | Tlalocite | Cu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2O |
| 7.DE.25 | Utahite | MgCu4Zn2Te6+3O14(OH)4 · 6H2O |
| 7.DE.35 | Coquandite | Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3) |
| 7.DE.40 | Osakaite | Zn4(SO4)(OH)6 · 5H2O |
| 7.DE.42 | Alterite | Zn2Fe3+4(SO4)4(C2O4)2(OH)4 · 17H2O |
| 7.DE.45 | Wilcoxite | MgAl(SO4)2F · 17H2O |
| 7.DE.45 | Barrotite | Cu9Al(HSiO4)2[(SO4)(HAsO4)0.5](OH)12 · 8H2O |
| 7.DE.47 | Tiberiobardiite | {Cu9Al[SiO3(OH)]2(OH)12(H2O)6}(SO4)1.5 · 10H2O |
| 7.DE.50 | Stanleyite | (V4+O)(SO4) · 6H2O |
| 7.DE.50 | Bouškaite | (MoO2)2O(SO3OH)2(H2O)4 |
| 7.DE.57 | Khangalasite | Fe(SO4)(OH) · 2H2O |
| 7.DE.60 | Hydrobasaluminite | Al4(SO4)(OH)10 · 12-36H2O |
| 7.DE.62 | Volaschioite | Fe4(SO4)O2(OH)6 · 2H2O |
| 7.DE.65 | Zaherite | Al12(SO4)5(OH)26 · 20H2O |
| 7.DE.75 | Camérolaite | Cu6Al3(OH)18(H2O)2[Sb(OH)6](SO4) |
Other Information
Notes:
Rapid dissolution in cold, 5 M HCl or in ammonium oxalate at pH 3.
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 Schwertmannite
mindat.org URL:
https://www.mindat.org/min-7281.html
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References for Schwertmannite
Reference List:
Localities for Schwertmannite
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.
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Jeremias Glück Mine, Garnsdorf, Saalfeld, Saalfeld-Rudolstadt District, Thuringia, Germany