The Probert Encyclopaedia of Rocks & Minerals

GIBBSITE

Gibbsite is a primarily secondary mineral named after George Gibbs, an American mineralogist. Gibbsite is a hydrate of alumina and gives off a clay-like smell when rubbed or breathed on. It is an important ore of aluminium. Typically it occurs massive, but rarely crystals are found in flattened, tubular, pseudo-hexagonal shapes. It is mostly white, reddish white or colourless with shades of grey, blue and green and a pearly or vitreous lustre.
Research Gibbsite