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Fougèrite

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Formula:
(Fe
2+
 
,Mg)
 
6
Fe
3+
2
(OH)
 
18
 · 4H
 
2
O
System:TrigonalColour:Bluish green
Member of:Manasseite Group
Name:For the type locality at Fougères Forest, Ille-et-Vilaine, Brittany, France.


Manasseite Group.

Unstable at normal conditions; the green, hexagonal, transparent platelets transform quickly into yellow-brown, opaque, often poorly crystalline iron oxyhydroxides (limonite, goethite).
Known previously as Green Rust, mainly from iron-rich slags.

Varieties containing Zn retain their green colour and transparency (Blaß et al., 1997).

Classification of Fougèrite

IMA status:Approved 2003
Strunz 8th edition ID:4/F.05-40
Strunz 9th edition ID:4.FL.05
Nickel-Strunz 10th (pending) edition ID:4.FL.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
Dana 8th edition ID:6.4.6.2

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
4 : Miscellaneous
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Type Occurrence of Fougèrite

Type Locality:Fougères Forest, Fougères, Ille-et-Vilaine, Brittany, France

Physical Properties of Fougèrite

Lustre:Earthy
Diaphaneity (Transparency):Opaque
Colour:Bluish green

Crystallography of Fougèrite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:R3m {R3 2/m}
Cell Parameters:a = 3.125Å, c = 22.5Å
Ratio:a:c = 1 : 7.2
Unit Cell Volume:V 190.29 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
7.97(100)
3.97(32)
2.692(34)
2.027(19)
1.595(9)
1.563(10)

Chemical Properties of Fougèrite

Formula:
(Fe
2+
 
,Mg)
 
6
Fe
3+
2
(OH)
 
18
 · 4H
 
2
O
Essential elements:Fe, H, O
All elements listed in formula:Fe, H, Mg, O

Relationship of Fougèrite to other Species

Member of:Manasseite Group
Other Members of Group:

- +
Barbertonite
Mg
 
6
(Cr,Al)
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
Manasseite
Mg
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
Sjögrenite
Mg
 
6
Fe
3+
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
4.FL.05Woodallite
Mg
 
6
Cr
 
2
(OH)
 
16
Cl
 
2
 · 4H
 
2
O
4.FL.05Iowaite
Mg
 
6
Fe
3+
2
(OH)
 
16
Cl
 
2
 · 4H
 
2
O
4.FL.05Jamborite
(Ni
2+
 
,Ni
3+
 
,Co,Fe)(OH)
 
2
(OH,S,H
 
2
O)
4.FL.05Meixnerite
Mg
 
6
Al
 
2
(OH)
 
18
 · 4H
 
2
O
4.FL.05Muskoxite
Mg
 
7
Fe
 
4
O
 
13
 · 10H
 
2
O
4.FL.10Hydrocalumite
Ca
 
2
Al(OH)
 
7
 · 2H
 
2
O
4.FL.15Kuzelite
Ca
 
4
Al
 
2.4
(OH)
 
12.8
(SO
 
4
) · 6H
 
2
O
4.FL.20Aurorite
(Mn
2+
 
,Ag,Ca)Mn
4+
3
O
 
7
 · 3H
 
2
O
4.FL.20Chalcophanite
(Zn,Fe,Mn)Mn
 
3
O
 
7
 · 3H
 
2
O
4.FL.20Ernienickelite
NiMn
 
3
O
 
7
 · 3H
 
2
O
4.FL.20Jianshuiite
(Mg,Mn)Mn
 
3
O
 
7
 · 3H
 
2
O
4.FL.25Woodruffite
Zn(Mn
4+
 
,Mn
3+
 
)
 
5
O
 
10
·3½H
 
2
O
4.FL.30Asbolane
(Ni,Co)
 
2-x
Mn
4+
 
(O,OH)
 
4
 · nH
 
2
O
4.FL.35Buserite
Na
 
4
Mn
 
14
O
 
27
 · 21H
 
2
O
4.FL.40Ranciéite
(Ca,Mn)Mn
 
4
O
 
9
 · 3H
 
2
O
4.FL.40Takanelite
(Mn,Ca)Mn
 
4
O
 
9
 · H
 
2
O
4.FL.45Birnessite
(Na,Ca)
 
0.5
(Mn
4+
 
,Mn
3+
 
)
 
2
O
 
4
 · 1.5H
 
2
O
4.FL.55Cianciulliite
Mn(Mg,Mn)
 
2
Zn
 
2
(OH)
 
10
 · 2-4H
 
2
O
4.FL.60Jensenite
Cu
 
3
[TeO
 
6
] · 2H
 
2
O
4.FL.65Leisingite
Cu(Mg,Cu,Fe,Zn)
 
2
[TeO
 
6
] · 6H
 
2
O
4.FL.70Akdalaite
4Al
 
2
O
 
3
 · H
 
2
O
4.FL.75Cafetite
(Ca,Mg)(Fe,Al)
 
2
Ti
 
4
O
 
12
 · 4H
 
2
O
4.FL.80Mourite
UMo
 
5
O
 
12
(OH)
 
10
4.FL.85Deloryite
Cu
 
4
(UO
 
2
)(MoO
 
4
)
 
2
(OH)
 
6

Other Names for Fougèrite

Synonyms:
Green RustIMA2003-057
Other Languages:

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Fougèrite

Reference List:

- +
Trolard, F., Abdelmoula, M., Bourrie, G., Humbert, B., Genin, J. (1996): Evidence of the occurrence of a 'green rusts' component in hydromorphic soils. Proposed existence of a new mineral fougerite. CRAS (Paris), serie IIa, 232, 1015-1022.

Blaß, G., Graf, H.-W. & Pichler, A. (1997): Sekundäre Neubildungen in Schlacken von St. Martin am Silberberg in Kärnten (2). Mineralien-Welt, 8(6), 54-55. (in German)

Refait, Ph., Abdelmoula, M., Rolard, F.T., Génin, J.-M.R., Ehrhardt J.J., Bourrié G.B. (2001): American Mineralogist 86, 731-739

Génin, J.-M.R., Refait, Ph., Bourrié, G., Abdelmoula, M., Trolard, F. (2001): Applied Geochemistry 16, 559-570.

Bourrié, G., Trolard, F., Refait, Ph., Feder, F. (2004): Clays and Clay Minerals 52, 382.

Feder, F., Trolard, F., Klingelhoefer, G., Bourrié, G. (2005): Variations with time and depth of the Fe3+ / Fetot. molar ratio in fougerite in a Gleysol. Evidence from in situ Mössbauer spectroscopy and soil solution composition. Geochimica et Cosmochimica Acta, 69, 4463–4483.

Trolard, F. et al. (2006): Structure of fougerite and green rusts and a thermodynamic model for their stabilities. J. Geol. Exploration 88, 248-251.

Trolard, F., Bourrié, G., Abdelmoula, M., Refait, Ph., Feder, F. (2007): Fougerite, a new mineral of the pyroaurite-iowaite group: description and crystal structure. Clays and Clay Minerals, 55, 323-334.

Christiansen, B.C., Dideriksen, K., Skovbjerg, L.L., Nedel, S., Stipp, S.L.S. (2011): On fougèrite. Clays and Clay Minerals, 59, 3-9.

Trolard, F. & Bourrié, G. (2011): Reply to the letter to the editor by Christiansen, Dideriksen, Skovbjerg, Nedel, and Stipp: "On fougèrite". Clays and Clay Minerals, 59, 10-12.

Internet Links for Fougèrite

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    • Localities for Fougèrite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Carinthia
      • Friesach - Hüttenberg area
        • St Martin am Silberberg
    		Blaß, G., Graf, H.-W. & Pichler, A. (1997): Sekundäre Neubildungen in Schlacken von St. Martin am Silberberg in Kärnten (2). Mineralien-Welt, 8(6), 54-55.
    Denmark
     
    • Hovedstaden
      • Copenhagen
    		Genin et al. (2005) Solid State Sciences, 7, 545-572.
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Saint-Amant-Tallende
          • Aydat
    		Symposium OS09, OS09 : TUam05 : G7, Authigenic Fe(II)-Fe(III) Oxihydroxides in Lacustrine Anoxic sediments (Aydat Lake, France), Evidenced by Sequential Chemical Extractions and Mössbauer Spectrometry, http://www.the-conference.com/JConfAbs/6/OS09.pdf.
    • Brittany
      • Ille-et-Vilaine
        • Fougères
    		F. Trolard et al.: CRAS (Paris), serie IIa, no. 232:1015-1022 (1996)
    Russia
     
    • Central Region
    		Pavel M. Kartashov data
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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