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  1. Wikipedia
    https://en.wikipedia.org › wiki › Ferrihydrite

    Ferrihydrite - Wikipedia

    • Ferrihydrite (Fh) is a widespread hydrous ferric oxyhydroxide mineral at the Earth's surface, and a likely constituent in extraterrestrial materials. It forms in several types of environments, from freshwater to marine systems, aquifers to hydrothermal hot springs and scales, soils, and areas affected by mining. It can be precipitated directly from oxygenated iron-ric… See more

    Structure

    Ferrihydrite only exists as a fine grained and highly defective nanomaterial. The powder X-ray diffraction pattern of Fh … See more

    Porosity and environmental absorbent potential

    Because of the small size of individual nanocrystals, Fh is nanoporous yielding large surface areas of several hundred square meters per gram. In addition to having a high surface area to volume ratio, Fh also ha… See more

    Image result for Ferrihydrite. Size: 156 x 200. Source: www.assignmentpoint.com
    Image result for Ferrihydrite. Size: 156 x 200. Source: www.mineralienatlas.de
    CategoryOxide minerals
    Formula (repeating unit)(Fe³⁺)₂O₃·0.5H₂O
    IMA symbolFhy
    Strunz classification4.FE.35
    Metastability

    Ferrihydrite is a metastable mineral. It is known to be a precursor of more crystalline minerals like hematite and goethite by aggregation-based crystal growth. However, its transformation in natural systems generally i… See more

    See also

    Better crystallized and less hydrated iron oxy-hydroxides are amongst others:
    • Akaganéite
    • Feroxyhyte
    • Goethite
    • Hematite… See more

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    Structure
    Porosity and environmental absorbent potential
    Quick Facts
    Metastability
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  1. ScienceDirect
    https://www.sciencedirect.com › ... › ferrihydrite

    Ferrihydrite - an overview | ScienceDirect Topics

  2. Science | AAAS
    https://www.science.org › doi

    The Structure of Ferrihydrite, a Nanocrystalline Material …

    Jun 22, 2007 · Abstract. Despite the ubiquity of ferrihydrite in natural sediments and its importance as an industrial sorbent, the nanocrystallinity of this iron …

    • Author: F. Marc Michel, Lars Ehm, Sytle M. Antao, Peter L. Lee, Peter J. Chupas, Gang Liu, Daniel R. Strongi...
    • Publish Year: 2007
  3. Nature
    https://www.nature.com › articles

    Direct identification of reaction sites on ferrihydrite - Nature

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  5. ACS Publications
    https://pubs.acs.org › doi

    Ferrihydrite Growth and Transformation in the …

    Nov 13, 2019 · Ferrihydrite (Fh) is a poorly crystalline Fe(III)-oxyhydroxide found in abundance in soils and sediments. With a high specific surface area and sorption capacity at circumneutral pH, ferrihydrite is an important player in the …

  6. Wiley Online Library
    https://onlinelibrary.wiley.com › doi › abs

    Ferrihydrite: A review of structure, properties and …

    Ferrihydrite occurs in soils undergoing rapid weathering, and in soils containing soluble silicate or organic anions which inhibit the formation of more crystalline iron oxides.