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Fougerite Mineral Data
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General Fougerite Information
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 Chemical Formula: |
(Fe++,Mg)6Fe+++2(OH)18•4(H2O) |
| Composition: |
Molecular Weight = 777.66 gm |
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Magnesium 4.69 % Mg 7.77 % MgO |
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Iron 46.68 % Fe 41.57 % FeO / 20.54 % Fe2O3 |
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Hydrogen 3.37 % H 30.12 % H2O |
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Oxygen 45.26 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Fe2+4.5Mg1.5Fe3+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 Foug�res Forest in the Ille-et-Vilaine region of France Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Synonym: |
Green Rust |
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IMA2003-057 |
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Fougerite Crystallography
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| 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 Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m |
| X Ray Diffraction: |
By Intensity(I/Io): 7.97(1), 2.692(0.34), 3.97(0.32),2.027(0.19), 1.563(0.1), 1.595(0.09), |
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Physical Properties of Fougerite
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| Color: |
Bluish gray. |
| Luster: |
Earthy (Dull) |
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Optical Properties of Fougerite
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| Optical Data: |
Uniaxial (?). |
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NCalc= 1.66 - from Gladstone-Dale relationship (KC = 0.2608) where Ncalc=Dcalc*KC+1
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Calculated Properties of Fougerite
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| Electron Density: |
Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Fougerite =2.54 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEFougerite = 13.77 barns/electron
U=PEFougerite x rElectron Density= 35.00 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fougerite is Not Radioactive |
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Fougerite Classification
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| Dana Class: |
06.04.06.02 (06)Hydroxides and Oxides Containing Hydroxyl |
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(06.04)containing multiple cations |
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(06.04.06)Dana Group |
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06.04.06.01 Meixnerite Mg6Al2(OH)18•4(H2O) R 3m 3 2/m |
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06.04.06.02 Fougerite! (Fe,Mg)6Fe2(OH)18•4(H2O) R 3m 3 2/m |
| Strunz Class: |
04.FE.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.F - Hydroxides (without V or U) |
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04.FE -Hydroxides with OH, without H2O; sheets of edge-sharing octahedra |
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04.FE.05 Amakinite (Fe,Mg)(OH)2 P 3m1 3 2/m |
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04.FE.05 Brucite Mg(OH)2 P 3m1 3 2/m |
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04.FE.05 Portlandite Ca(OH)2 P 3m1 3 2/m |
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04.FE.05 Pyrochroite Mn(OH)2 P 3m1 3 2/m |
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04.FE.05 Theophrastite Ni(OH)2 P 3m1 3 2/m |
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04.FE.05 Fougerite! (Fe,Mg)6Fe2(OH)18•4(H2O) R 3m 3 2/m |
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Other Fougerite Information
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| See Also: |
Links to other databases for Fougerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Fougerite Specimen Label here :
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Fougerite
(Fe++,Mg)6Fe+++2(OH)18•4(H2O)
Dana No: 06.04.06.02 Strunz No: 04.FE.05
Locality:
Notes:
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