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Proto-goethite

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Formula:
FeOOH
Crystal System:
Orthorhombic
Isostructural with:
A nanophase being a precursor to goethite, of guyanaite-type structure. Intermediate between feroxyhyte and goethite. Found together with feroxyhyte, ferrihydrite, and goethite, in Fe-rich freshwater nodules.

The structure is based on single chains of edge-sharing FeO6 octahedra and is thus different from goethite, but resembles HP polymorphs of FeOOH and InOOH.




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Classification of Proto-goethiteHide

Notes:
Published without approval

Chemical Properties of Proto-goethiteHide

Formula:
FeOOH

Crystallography of Proto-goethiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 2.960-2.994 Å, b = 4.898-4.937 Å, c = 4.347-4.432 Å
Ratio:
a:b:c = 0.604 : 1 : 0.888
Unit Cell V:
63.02 ų (Calculated from Unit Cell)
Comment:
Pm21n; first cell parameter value is calculated and the second one is experimental

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 Proto-goethiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Lee, S., Shen, Z., Xu, H. (2016): Study on nanophase iron oxyhydroxides in freshwater ferromanganese nodules from Green Bay, Lake Michigan. American Mineralogist (in press); future doi: 10.2138/am-2016-5729

Internet Links for Proto-goethiteHide

Mineral and/or Locality  
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