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Schwertmannite Mineral Data

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General Schwertmannite Information

Help on Chemical  Formula: Chemical Formula: Fe+++16O16(OH)12(SO4)2
Help on Composition: Composition: Molecular Weight = 1,545.76 gm
   Iron      57.81 %  Fe   82.65 % Fe2O3
   Hydrogen   0.78 %  H     6.99 % H2O
   Sulfur     4.15 %  S    10.36 % SO3
   Oxygen    37.26 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+16O16(OH)12(SO4)2
Help on Environment: Environment: As a secondary precipitate forming crusts on material inundated by acidic (pH 3.2) drainage water.
Help on IMA Status: IMA Status: Approved IMA 1994
Help on Locality: Locality: Pyhasalmi sulfide mine, Province or Oulu, Finland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: In honor of Udo Schwertmann (1922 - ).
Help on Name Pronunciation: Name Pronunciation: Schwertmannite + Pronunciation Say SCHWERTMANNITE
Help on Synonym: Synonym: IMA1990-006

Schwertmannite Image

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Comments: Orange-brown, earthy schwertmannite.
Location: Jachymov, Bohemia, Czech Republic. Scale: Not Given.
© Diederik Visser

Schwertmannite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.5666
Help on Cell Dimensions: Cell Dimensions: a = 10.66, c = 6.04, Z = 1; V = 686.36 Den(Calc)= 3.74
Help on Crystal System: Crystal System: Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: P 4/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.55(1), 3.39(0.46), 4.86(0.37),

Physical Properties of Schwertmannite

Help on Color: Color: Brownish yellow.
Help on Density: Density: 3.77 - 3.99, Average = 3.88
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Unknown - Minerals too small to observe fractures.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 2.5-3.5 - Finger Nail-Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: brownish yellow

Optical Properties of Schwertmannite

Help on Optical Data: 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

Calculated Properties of Schwertmannite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Schwertmannite =3.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PESchwertmannite = 17.66 barns/electron
U=PESchwertmannite x rElectron Density= 63.93 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Schwertmannite is Not Radioactive

Schwertmannite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.04)containing multiple cations
  (06.04.10)Dana Group Schwertmannite Fe16O16(OH)12(SO4)2 P 4/m 4/m
Help on  Strunz Class: Strunz Class: 07.DE.15 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DE -With only medium-sized cations; unclassified
07.DE.15 Schwertmannite Fe16O16(OH)12(SO4)2 P 4/m 4/m

Other Schwertmannite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.80,p847,1995)
Help on See Also: 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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Dana No: Strunz No: 07.DE.15





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