Mineralogy Database

Goethite Mineral Data

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General Goethite Information

Help on Chemical  Formula: Chemical Formula: Fe+++O(OH)
Help on Composition: Composition: Molecular Weight = 88.85 gm
   Iron      62.85 %  Fe   89.86 % Fe2O3
   Hydrogen   1.13 %  H    10.14 % H2O
   Oxygen    36.01 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+O(OH)
Help on Environment: Environment: Common in iron ore deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1806
Help on Locality: Locality: Mesabi district, Minnesota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the German poet, J. W. Goethe (1749-1832).
Help on Name Pronunciation: Name Pronunciation: Goethite Say GOETHITE
Help on Synonym: Synonym: Acicular iron ore
  ICSD 28247
  Needle ironstone
  PDF 29-713