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Fougèrite

Formula:
(Fe
2+
 
,Mg)
 
6
Fe
3+
2
(OH)
 
18
 · 4H
 
2
O
System:TrigonalColour:Bluish green
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.

Varities 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, 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)

Chemical Properties of Fougèrite

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

Relationship of Fougèrite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FL.05Woodallite
Mg
 
6
Cr
 
2
(OH)
 
16
Cl
 
2
·4H
 
2
O
4.FL.05Iowaite
Mg
 
4
Fe(OH)
 
8
OCl·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, no. 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. "Structure of fougerite and green rusts and a thermodynamic model for their stabilities", J. Geol. Exploration 88,248-251(2006)

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.

Articles/Blogs about Fougèrite

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    Localities for Fougèrite

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    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.
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    (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.
    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
    		F. Trolard et al.: CRAS (Paris), serie IIa, no. 232:1015-1022 (1996)
    Mineral and/or Locality
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