Fougerita

Infotaula de mineralFougerita

Modifica el valor a Wikidata
Fórmula químicaFe₄2+Fe₂3+(OH)₁₂[CO₃]·3H₂O
EpònimFougères Forest (en) Tradueix Modifica el valor a Wikidata
Localitat tipusBosc de Fougères, Fougères, Ille-et-Vilaine, Bretanya, França
Classificació
Categoriaòxids
Nickel-Strunz 10a ed.4.FL.05
Nickel-Strunz 9a ed.4.FL.05 Modifica el valor a Wikidata
Dana6.4.6.2
Propietats
Sistema cristal·lítrigonal
Estructura cristal·linaa = 3,125Å; c = 22,5Å;
Grup puntual3m (3 2/m) - hexagonal escalenoedral
Colorverd blavós
Lluïssorterrosa
Diafanitatopaca
Més informació
Estatus IMAmineral redefinit (Rd) i aprovat Modifica el valor a Wikidata
Codi IMAIMA2003-057
SímbolFgè Modifica el valor a Wikidata
Referències[1]

La fougerita és un mineral recentment descrit de la classe dels òxids. És l'arquetip del Grup de la fougerita dins del més gran Supergrup de la hidrotalcita d'hidròxids en doble capa que es presenten de manera natural.[2] La seva estructura està basada en les capes de la brucita que contenen cations Fe2+ i Fe3+, anions O2− i OH−,amb enllaços [CO₃]2− i H₂O. La Fougerita cristal·litza en el sistema trigonal. La formula ideal per a la fougèrita és [Fe2+₄Fe3+₂(OH)₁₂][CO₃]·3H₂O.

La Fougerita es va trobar primer en sòls forestals prop de Fougères, Bretanya, França, i es va reconèixer com mineral vàlid per la International Mineralogical Association el 2002.[1] És de color vers-blau a gris blavenc i sembla els minerals d'argila en hàbit. Aquest mineral és inestable a l'aire, i es descompon per oxidació, deshidratació i descarbonació a ferrihidrita, i finalment a lepidocrocita o goethita, Fe3+O(OH).[3][4]

Referències

A Wikimedia Commons hi ha contingut multimèdia relatiu a: Fougerita
  1. ↑ 1,0 1,1 «Fougèrite» (en anglès). Mindat. [Consulta: 29 novembre 2017].
  2. ↑ Mills, S.J., Christy, A.G., Génin J.-M.R., Kameda, T. and Colombo, F. 2012: Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides, Mineralogical Magazine, 76, 1289-1336. [1] Arxivat 2013-05-24 a Wayback Machine.
  3. ↑ Trolard F., Bourrié G., Abdelmoula M., Refait P. and Feder F. 2007: Fougerite, a new mineral of the pyroaurite-iowaite group: description and crystal structure, Clays and Clay Minerals, vol. 55, no. 3, p. 323-334; doi:10.1346/CCMN.2007.0550308
  4. ↑ 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, vol. 7., no. 5, p. 545-572. doi:10.1016/j.solidstatesciences.2005.02.001

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