White crystalline mineral consisting of aluminum hydroxide

• A constituent of bauxite and a source of alumina

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Gibbsite \Gibbs"ite\, n. [Named after George Gibbs.] (Min.) A hydrate of alumina.

Wiktionary Word definitions in Wiktionary
n. (context mineral English) A mineral with monoclinic crystals, usually white but can have different colors, aluminum(oxygenhydrogen) 3 .

WordNet Word definitions in WordNet
n. white crystalline mineral consisting of aluminum hydroxide; a constituent of bauxite and a source of alumina

Wikipedia Word definitions in Wikipedia
Gibbsite , Al(OH), is one of the mineral forms of aluminium hydroxide . It is often designated as γ-Al(OH) (but sometimes as α-Al(OH).). It is also sometimes called hydrargillite (or hydrargyllite). Gibbsite is an important ore of aluminium in that it is ...