Definition of gibbsite in US English:



  • A colorless mineral consisting of aluminum hydroxide, occurring chiefly as a constituent of bauxite or in encrustations.

    • ‘The Al concentration is adapted to equilibrium with gibbsite.’
    • ‘Its structure is predicted from the known structures of nordstrandite and gibbsite on the basis of similarities in X-ray precession photographs in two zones.’
    • ‘Only detailed sampling of early weathering stages combined with suitable analytical techniques can reveal the presence of gibbsite as a primary weathering product in certain weathering crusts of acid igneous rocks.’
    • ‘‘This particular sample is a cryptocrystalline stalactitic aggregate, composed of concentric layers of gibbsite of variable purity.’’
    • ‘The remaining clay component from the limestone can be further altered by these acids and, over time, it is converted to aluminium oxyhydroxide minerals such as gibbsite, diaspore, and boehmite.’


Early 19th century: named after George Gibbs (1776–1833), American mineralogist, + -ite.