gibbsiteArticle Free Pass gibbsite, the mineral aluminum
hydroxide [Al(OH)3] an important constituent of bauxite
deposits, particularly those in the Western Hemisphere, where it
occurs as white, glassy crystals, earthy masses, or crusts. In
significant deposits it is of secondary origin, but small-scale
hydrothermal sources are known. Under extreme weathering
conditions, it may develop from any aluminous material,
especially feldspars and feldspathoids; it may form from these
directly or from boehmite or after the intermediate formation of
clay minerals. Gibbsite is prominent in bauxites from Arkansas,
Jamaica, Suriname, Guyana, Brazil, West Africa, and India.
Synthetic gibbsite is made from bauxite or high-alumina
materials for use in the production of aluminum metal and
alumina chemicals. For detailed physical properties, see oxide
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