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About FougèriteHide

Bluish green, green, green-black, blackish
Crystal System:
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 (or green-black, blackish), hexagonal, transparent platelets transform quickly into yellow-brown to brown, opaque, often poorly crystalline, brittle 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 FougèriteHide

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 FougèriteHide

Bluish green, green, green-black, blackish
Only when fresh; alters within hours and days

Chemical Properties of FougèriteHide

IMA Formula:
Fe2+4Fe3+2(OH)12(CO3) · 3H2O

Crystallography of FougèriteHide

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 V:
190.29 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:

Type Occurrence of FougèriteHide

Synonyms of FougèriteHide

Relationship of Fougèrite to other SpeciesHide

Other Members of this group:
MössbaueriteFe3+6O4(OH)8[CO3] · 3H2O Trig. 3
TrébeurdeniteFe2+2Fe3+4O2(OH)10CO3·3H2OTrig. 3m (3 2/m) : R3m

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Fougèrite associated with LeadPb
2 photos of Fougèrite associated with GypsumCaSO4 · 2H2O
2 photos of Fougèrite associated with CerussitePbCO3
1 photo of Fougèrite associated with CupriteCu2O
1 photo of Fougèrite associated with LeadhillitePb4(CO3)2(SO4)(OH)2

Related Minerals - Nickel-Strunz GroupingHide

4.FL.TrébeurdeniteFe2+2Fe3+4O2(OH)10CO3·3H2OTrig. 3m (3 2/m) : R3m
4.FL.05WoodalliteMg6Cr2(OH)16Cl2 · 4H2OTrig.
4.FL.05IowaiteMg6Fe3+2(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
4.FL.05JamboriteNi2+1-xCo3+x(OH)2-x(SO4)x · nH2OTrig. 3m (3 2/m) : R3m
4.FL.05MeixneriteMg6Al2(OH)16(OH)2 · 4H2OTrig. 3m (3 2/m) : R3m
4.FL.05MuskoxiteMg7Fe4O13 · 10H2OTrig. 3m (3 2/m)
4.FL.10HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2OMon. 2 : P21
4.FL.15KuzeliteCa4Al2(OH)12[SO4] · 6H2OTrig.
4.FL.20AuroriteMn2+Mn4+3O7 · 3H2OTrig. 3 : R3
4.FL.20ChalcophaniteZnMn4+3O7 · 3H2OTrig. 3 : R3
4.FL.20ErnienickeliteNiMn3O7 · 3H2OTrig. 3 : R3
4.FL.20Jianshuiite(Mg,Mn,Ca)Mn3O7 · 3H2OTrig. 3 : R3
4.FL.25WoodruffiteZn2+x/2(Mn4+1-xMn3+x)O2·yH2OMon. 2/m : B2/m
4.FL.30Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2OHex.
4.FL.35BuseriteNa4Mn14O27 · 21H2O
4.FL.40Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2OTrig. 3 : P3
4.FL.40Takanelite(Mn,Ca)Mn4O9 · H2OHex.
4.FL.45Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2OMon. 2/m : B2/m
4.FL.55CianciulliiteMn(Mg,Mn)2Zn2(OH)10 · 2-4H2OMon. 2/m : B2/m
4.FL.60JenseniteCu3[TeO6] · 2H2OMon. 2/m : P21/m
4.FL.65LeisingiteCuMg2Te6+O6 · 6H2OTrig. 3 : P3
4.FL.70Akdalaite5Al2O3 · H2OHex.
4.FL.75CafetiteCaTi2O5 · H2OMon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide · 4H2OTrig. 3m (3 2/m) : R3m

Other InformationHide

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 FougèriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nieding, E. (1985): Rezente Mineralbildungen in urzeitlichen Kupferschlacken aus Österreich. Aufschluss, 36, 313–318 (in German).
Nieding, E. (1986): Pseudohexagonaler Goethit aus einer Schlacke von Lölling/Kärnten. Carinthia II, 176./96., 57–59 (in German).
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 FougèriteHide

Localities for FougèriteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • 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.
  • Salzburg
    • Hohe Tauern
      • Rauris valley
        • Hüttwinkl valley
Schebesta, K. (Autoren) Seltene Mineralien aus den alten Goldschlacken im Rauriser Tal, Österreich Jahrgang 1984, Heft März, Seite:
  • Styria
    • Ennstaler Alpen
      • Johnsbach
        • Severinggraben
peter neschen collection; peter neschen collection
  • Upper Austria
    • Steyr
      • Slag localities
peter neschen collection
  • Wallonia
    • Liège
      • 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.
  • Newfoundland and Labrador
    • Newfoundland
      • Baie Verte Peninsula
        • Tilt Cove
Norman Wilson collection
  • Capital Region
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
      • Villefranche
        • 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
    • Arnsberg
      • Märkischer Kreis
        • Iserlohn
          • Letmathe
Bender, D. and Krimmelbein, W. (1994) Aktuelle Übersicht: Mineralien der Zinkhütte Genna/Sauerland. Stand Juni 1994. Mineralien-Welt, 4/94, 10.
    • Cologne
      • 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.
      • Euskirchen
        • Mechernich
          • Kall
Blaß, G. & Graf, H. W. (1995): Neufunde von Schlackenhalden in der nördlichen Eifel (II). Mineralien-Welt, 6 (3), 28-31.
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion District slag localities
          • Sounion area
Laurion The minerals in the ancient slags by Piet Gelade etc.Ko Jansen.
Pavel M. Kartashov data
  • England
    • County Durham
      • Castleside
Norman Wilson collection
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