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Schwertmannite Mineral Data
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General Schwertmannite Information
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 Chemical Formula: |
Fe+++16O16(OH)12(SO4)2 |
| Composition: |
Molecular Weight = 1,545.76 gm |
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Iron 57.81 % Fe 82.65 % Fe2O3 |
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Hydrogen 0.78 % H 6.99 % H2O |
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Sulfur 4.15 % S 10.36 % SO3 |
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Oxygen 37.26 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Fe3+16O16(OH)12(SO4)2 |
| Environment: |
As a secondary precipitate forming crusts on material inundated by acidic (pH 3.2) drainage water. |
| IMA Status: |
Approved IMA 1994 |
| Locality: |
Pyhasalmi sulfide mine, Province or Oulu, Finland. Link to MinDat.org Location Data. |
| Name Origin: |
In honor of Udo Schwertmann (1922 - ). |
| Name Pronunciation: |
Schwertmannite + Pronunciation  |
| Synonym: |
IMA1990-006 |
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Schwertmannite Image |
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Images:
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Schwertmannite Crystallography
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| Axial Ratios: |
a:c = 1:0.5666 |
| Cell Dimensions: |
a = 10.66, c = 6.04, Z = 1; V = 686.36 Den(Calc)= 3.74 |
| Crystal System: |
Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: P 4/m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.55(1), 3.39(0.46), 4.86(0.37), |
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Physical Properties of Schwertmannite
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| Color: |
Brownish yellow. |
| Density: |
3.77 - 3.99, Average = 3.88 |
| Diaphaneity: |
Opaque |
| Fracture: |
Unknown - Minerals too small to observe fractures. |
| Habit: |
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). |
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
| Hardness: |
2.5-3.5 - Finger Nail-Copper Penny |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Earthy (Dull) |
| Streak: |
brownish yellow |
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Optical Properties of Schwertmannite
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| Optical Data: |
NCalc= 2.13 - from Gladstone-Dale relationship (KC = 0.3025) where Ncalc=Dcalc*KC+1
NCalc= 2.17 - from Gladstone-Dale relationship (KC = 0.3025) where Ncalc=Dmeas*KC+1
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Calculated Properties of Schwertmannite
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| Electron Density: |
Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Schwertmannite =3.74 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PESchwertmannite = 17.66 barns/electron
U=PESchwertmannite x rElectron Density= 63.93 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schwertmannite is Not Radioactive |
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Schwertmannite Classification
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| Dana Class: |
06.04.10.01 (06)Hydroxides and Oxides Containing Hydroxyl |
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(06.04)containing multiple cations |
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(06.04.10)Dana Group |
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06.04.10.01 Schwertmannite Fe16O16(OH)12(SO4)2 P 4/m 4/m |
| Strunz Class: |
07.DE.15 07 - SULFATES (SELENATES, TELLURATES) |
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07.D - Sulfates (selenates, etc.) with additional anions, with H2O |
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07.DE -With only medium-sized cations; unclassified |
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07.DE.15 Schwertmannite Fe16O16(OH)12(SO4)2 P 4/m 4/m |
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Other Schwertmannite Information
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| References: |
NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p847,1995) |
| See Also: |
Links to other databases for Schwertmannite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
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Print or Cut-and-Paste your Schwertmannite Specimen Label here :
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Schwertmannite
Fe+++16O16(OH)12(SO4)2
Dana No: 06.04.10.01 Strunz No: 07.DE.15
Locality:
Notes:
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