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Bluish green
For the type locality at Fougères Forest, Ille-et-Vilaine, Brittany, France.
The mineral formerly described as fougèrite has been found to be an intimate intergrowth of two phases with distinct Fe2+:Fe3+ ratios. The phase with Fe2+:Fe3+ = 2:1 retains the name fougèrite; that with Fe2+:Fe3+ = 1:2 is defined as the new species trébeurdenite. Both belong to the Fougèrite Group (Mills et al., 2012).

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

Approval Year:

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

4 : Miscellaneous

Physical Properties of Fougèrite

Diaphaneity (Transparency):
Bluish green

Chemical Properties of Fougèrite

IMA Formula:
Fe42+Fe23+(OH)12(CO3) · 3H2O
Elements listed in formula:

Crystallography of Fougèrite

Crystal System:
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
Cell Parameters:
a = 3.125 Å, c = 22.5 Å
a:c = 1 : 7.2
Unit Cell Volume:
V 190.29 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:

Type Occurrence of Fougèrite

Relationship of Fougèrite to other Species

Other Members of Group:
MössbaueriteFe63+O4(OH)8[CO3] · 3H2O
4.FL.05WoodalliteMg6Cr2(OH)16Cl2 · 4H2O
4.FL.05IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
4.FL.05MeixneriteMg6Al2(OH)16(OH)2 · 4H2O
4.FL.05MuskoxiteMg7Fe4O13 · 10H2O
4.FL.10HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
4.FL.15KuzeliteCa4Al2(OH)12[SO4] · 6H2O
4.FL.20Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
4.FL.20Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
4.FL.20ErnienickeliteNiMn3O7 · 3H2O
4.FL.20Jianshuiite(Mg,Mn,Ca)Mn3O7 · 3H2O
4.FL.30Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
4.FL.35BuseriteNa4Mn14O27 · 21H2O
4.FL.40Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O
4.FL.40Takanelite(Mn,Ca)Mn4O9 · H2O
4.FL.45Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
4.FL.55CianciulliiteMn(Mg,Mn)2Zn2(OH)10 · 2-4H2O
4.FL.60JenseniteCu3[TeO6] · 2H2O
4.FL.65LeisingiteCuMg2Te6+O6 · 6H2O
4.FL.70Akdalaite5Al2O3 · H2O
4.FL.75CafetiteCaTi2O5 · H2O

Other Names for Fougèrite

Name in Other Languages:

Other Information

Health Risks:
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.

Génin J.-M. R., Aïssa R., Géhin A., Abdelmoula M., Benali O., Ernstsen V., Ona-Nguema G., Upadhyay Ch. and Ruby Ch. (2005): Fougerite and FeII-III hydroxycarbonate green rust; ordering, deprotonation and/or cation substitution; structure of hydrotalcite-like compounds and mythic ferrosic hydroxide Fe(OH)2+x. Solid State Sciences, 7, 545-572.

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.; Balić-Žunić, T.; Petit, P.-O.; Frandsen, C.; Mørup, S.; Geckeis, H.; Katerinopoulou, A.; Stipp, S. L. Svane (2009): Composition and structure of an iron-bearing, layered double hydroxide (LDH) - Green rust sodium sulphate. Geochimica et Cosmochimica Acta 73, 3579-3592.

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.

Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Internet Links for Fougèrite URL:
Please feel free to link to this page.

Localities for Fougèrite

This 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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
  • 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.
  • Styria
    • Ennstaler Alpen
      • Johnsbach
        • Severinggraben
peter neschen collection; peter neschen collection
  • Upper Austria
    • Steyr
      • Slag localities
peter neschen collection
  • Liège Province
    • Verviers
      • Plombières-Vieille Montagne-Moresnet (Plombières-Altenberg-Moresnet) mining district
        • Plombières (Blieberg; Bleiberg; Bleyberg)
Blaß, G. & Graf, H. W. (1995b): Neufunde von Schlackenhalden in der nördlichen Eifel (II). Mineralien-Welt, 6 (3), 28-31.
  • Capital Region
    • Copenhagen
Genin et al. (2005) Solid State Sciences, 7, 545-572.
  • Auvergne-Rhône-Alpes
    • Loire
      • La Pacaudière
        • Le Crozet
Chollet, P. & Devouard, B. (2013): La mine de cuivre et de plomb des Rats, Le Crozet (Loire). Le Règne Minéral, 109, 7-46.
    • 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,
    • Rhône
      • Le Bois d'Oingt
        • Chessy-les-Mines
          • Chessy copper mines
Paul Poulain, Chollet Pascal, Yannick Vessely, Lucien Cluzaud collections
  • Brittany
    • Finistère
      • Poullaouen
Chollet Pascal collection
    • Ille-et-Vilaine
      • Fougères
F. Trolard et al.: CRAS (Paris), serie IIa, no. 232:1015-1022 (1996)
  • North Rhine-Westphalia
    • Aachen
      • Eschweiler
Blaß, G. & Graf, H. W. (1995): Neufunde von Schlackenhalden in der nördlichen Eifel (II). Mineralien-Welt, 6 (3), 28-31.
      • Stolberg
Blaß, G. & Graf, H. W. (1995): Neufunde von Schlackenhalden in der nördlichen Eifel (II). Mineralien-Welt, 6 (3), 28-31.
Blaß, G. & Graf, H. W. (1995): Neufunde von Schlackenhalden in der nördlichen Eifel (II). Mineralien-Welt, 6 (3), 28-31.
    • Eifel
      • Mechernich
        • Kall
Blaß, G. & Graf, H. W. (1995): Neufunde von Schlackenhalden in der nördlichen Eifel (II). Mineralien-Welt, 6 (3), 28-31.
    • Sauerland
      • Iserlohn
        • Letmathe
Bender, D.; Krimmelbein, M. & W; Altena (1994): Aktuelle Übersicht: Mineralien der Zinkhütte Genna/Sauerland. in Mineralien-Welt, 4, p.10
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District slag localities
        • Sounion area
Laurion The minerals in the ancient slags by Piet Gelade etc.Ko Jansen.
  • Central Region
Pavel M. Kartashov data
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