Fougerite Mineral Data

Fougerite Mineral Data

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General Fougerite Information

Chemical Formula:

(Fe++,Mg)6Fe+++2(OH)18·4(H2O)

Composition:

Molecular Weight = 777.66 gm

Magnesium 4.69 % Mg 7.77 % MgO

Iron 46.68 % Fe 41.57 % FeO / 20.54 % Fe₂O₃

Hydrogen 3.37 % H 30.12 % H₂O

Oxygen 45.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_4.5Mg_1.5Fe³⁺₂(OH)₁₈·4(H₂O)

Environment:

Poorly drained soils ensuring reducing conditions. Meixnerite group

IMA Status:

Proposed IMA 2003 (Dana # Added)

Locality:

Discovered coloring (green) the soil of the Fougères Forest in the Ille-et-Vilaine region of France Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

Green Rust

IMA2003--057

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Fougerite Crystallography

Axial Ratios:

a:c = 1:7.19999

Cell Dimensions:

a = 3.125, c = 22.5, Z = 0.375; V = 190.29 Den(Calc)= 2.54

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 7.97(1), 2.692(0.34), 3.97(0.32),2.027(0.19), 1.563(0.1), 1.595(0.09),

Physical Properties of Fougerite

Color:

Bluish gray.

Luster:

Earthy (Dull)

Optical Properties of Fougerite

Optical Data:

Uniaxial (?).

Calculated Properties of Fougerite

Electron Density:

r_electron=2.54 gm/cc
note: r_Fougerite=2.54 gm/cc.

Fermion Index

Fermion Index = 0.0148
Boson Index = 0.9852

Photoelectric:

PE_Fougerite= 13.77 barns/electron
U=PE_Fougerite x r_electron= 35.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fougerite is Not Radioactive

Fougerite Classification

Dana Class:

6.4.6.2 (6)Hydroxides and Oxides Containing Hydroxyl

(6.4)containing multiple cations

(6.4.6)Dana Group

6.4.6.1 Meixnerite Mg6Al2(OH)18·4(H2O) R 3m 3 2/m

6.4.6.2 Fougerite ! (Fe,Mg)6Fe2(OH)18·4(H2O) R 3m 3 2/m

Strunz Class:

IV/X.00-00 IV - Oxides

IV/X - Unclassified Strunz Oxides

IV/X.00 - Hydroxide, Hydrated

Other Fougerite Information

See Also:

Links to other databases for Fougerite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Fougerite Specimen Label here :

Fougerite

(Fe++,Mg)6Fe+++2(OH)18·4(H2O)
Dana No: 6.4.6.2 Strunz No: IV/X.00-00
Locality:

Notes: