Schwertmannite Mineral Data

Schwertmannite Mineral Data +

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General Schwertmannite Information

Chemical Formula:

Fe+++16O16(OH)12(SO4)2

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

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 - ).

Synonym:

IMA1990-006

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Schwertmannite Crystallography

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 - DipyramidalH-M Symbol (4/m) Space Group: P 4/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.55(1), 3.39(0.46), 4.86(0.37),

Physical Properties of Schwertmannite

Color:

Brownish yellow.

Density:

3.77 - 3.99, Average = 3.88

Diaphaniety:

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

Optical Properties of Schwertmannite

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

Electron Density:

r_electron=3.62 gm/cc
note: r_{Schwertmannite}=3.74 gm/cc.

Fermion Index

Fermion Index = 0.01274
Boson Index = 0.98726

Photoelectric:

PE_{Schwertmannite}= 17.66 barns/electron
U=PE_{Schwertmannite} x r_electron= 63.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schwertmannite is Not Radioactive

Schwertmannite Classification

Dana Class:

6.4.10.1 (6)Hydroxides and Oxides Containing Hydroxyl

(6.4)containing multiple cations

(6.4.10)Dana Group

6.4.10.1 Schwertmannite Fe16O16(OH)12(SO4)2 P 4/m 4/m

Strunz Class:

VI/B.04-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. cations of medium size

VI/B.04 - D`ansite - Schwerdtmannite series

VI/B.04-10 Dansite Na21Mg(SO4)10Cl3 I 43m 4 3m

VI/B.04-20 Yeelimite Ca4Al6O12(SO4) I 4₁32 4 3 2

VI/B.04-30 Schwertmannite Fe16O16(OH)12(SO4)2 P 4/m 4/m

Other Schwertmannite Information

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Schwertmannite

Fe+++16O16(OH)12(SO4)2
Dana No: 6.4.10.1 Strunz No: VI/B.04-30
Locality:

Notes: