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铝土矿全部是风化作用形成的，无一例外。地球上含铝（含少量铝质也可以）岩石在适宜的气候和地形条件下，风化成红土矿物，包括铝土矿物及少量粘土矿物、含铁矿物及少量含钛矿物等风化壳铝土物质（红土铝土物质）。第四纪以前的古风化作用形成的是古风化壳铝土物质（古红土铝土物质），迁移就位以后便形成风化壳铝土矿床（红土铝土矿床）。深埋地下经过成岩变化，再随地壳抬升进入地壳浅部，或地表的叫古风化壳铝土矿床。我国９８％是古风化壳铝土矿床，即国外所称的喀斯特铝土矿床。由于其迁移就位方式不同，便形成了不同的风化壳和古风化壳（亚型）矿床
Bauxite is all formed by weathering, without exception. Containing aluminum (with a small amount of aluminum is also possible) Earth’s rock weathering into lateritic minerals, including bauxite and a small amount of clay minerals, iron-bearing minerals and a small amount of titanium-bearing minerals, weathering the shell under appropriate climatic and topographical conditions Soil material (laterite bauxite material). The paleo-weathering of the Quaternary resulted in the formation of weathered crust bauxite (lateritic bauxite), which formed the weathered crust bauxite deposit (laterite bauxite deposit) after the migration took place. Deep underground through diagenetic changes, and then uplift with the crust into the shallow crust, or the surface of the ancient weathered crust bauxite deposits. 98% of our country is weathered bauxite deposit, which is called karst bauxite abroad. Due to their different migration modes, different weathering crusts and ancient weathering crust (subtype) deposits have been formed