Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

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:
Lead2 photos of Fougèrite associated with Lead on mindat.org.
Gypsum2 photos of Fougèrite associated with Gypsum on mindat.org.
Cerussite2 photos of Fougèrite associated with Cerussite on mindat.org.
Cuprite1 photo of Fougèrite associated with Cuprite on mindat.org.
Leadhillite1 photo of Fougèrite associated with Leadhillite on mindat.org.

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.20Aurorite(Mn2+,Ag,Ca)Mn4+3O7 · 3H2OTrig. 3 : R3
4.FL.20Chalcophanite(Zn,Fe,Mn)Mn3O7 · 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.
  • 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
    • 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, http://www.the-conference.com/JConfAbs/6/OS09.pdf.
    • 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
    • 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. and Krimmelbein, W. (1994) Aktuelle Übersicht: Mineralien der Zinkhütte Genna/Sauerland. Stand Juni 1994. Mineralien-Welt, 4/94, 10.
  • 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
    • Co. Durham
      • Castleside
Norman Wilson collection
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: February 24, 2019 01:49:11 Page generated: February 18, 2019 12:12:50
Go to top of page