How is aluminium distributed in common minerals

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Detailed Solution

Aluminium is distributed mainly in silicate minerals like feldspars, micas, and clays, as well as in aluminium oxides and hydroxides such as bauxite.

Main host minerals

Mineral group	Examples	Al content
Feldspars	Orthoclase (KAlSi₃O₈), Plagioclase (NaAlSi₃O₈–CaAl₂Si₂O₈)	Major aluminium reservoir in igneous rocks
Micas	Muscovite (KAl₂(AlSi₃O₁₀)(OH)₂)	High aluminium, layered silicate
Clays	Kaolinite (Al₂Si₂O₅(OH)₄)	Weathering product rich in Al
Oxides	Corundum (Al₂O₃)	Dense aluminium oxide
Hydroxides	Gibbsite, Boehmite	Principal bauxite minerals

Distribution notes

Igneous rocks: Feldspars dominate granite and basalt, carrying aluminium.
Sedimentary rocks: Weathering forms aluminium-rich clays and laterite soils.
Ore deposits: Tropical weathering concentrates aluminium hydroxides into bauxite.

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