Definition of goethite in English:



mass noun
  • A dark or yellowish-brown mineral consisting of hydrated iron oxide, occurring typically as masses of fibrous crystals.

    • ‘Although each mound had substantial amounts of quartz and kaolinite, minerals that reflected differences in mound material included magnetite, gypsum, hornblende, hematite, goethite, and feldspars.’
    • ‘Tiny crystals of hematite, goethite, chalcopyrite, marcasite, and dolomite are common and make excellent micromounts.’
    • ‘Crystals commonly display rhombic dodecahedral morphology, are generally small, and are frequently replaced by goethite or other iron oxides/hydroxides.’
    • ‘It includes goethite on quartz, secondary quartz enclosing already crystallized goethite, and goethite and secondary quartz crystallizing together.’
    • ‘Some of this quartz exhibits amethyst coloration, and the totally included goethite obviously crystallized at the same time the quartz was forming.’


Early 19th century: from the name of J.W. von Goethe, Johann Wolfgang von + -ite.