Cov khoom siv hlau ntau tshaj plaws nyob rau hauv lub ntiaj teb crust, nrog rau cov ntsiab lus ntawm 8.3%. Feem ntau pom muaj nyob rau hauv aluminosilicate ores, nrog rau bauxite thiab cryolite. Aluminium oxide yog cov hmoov dawb amorphous uas tuaj nyob hauv ntau qhov kev hloov pauv, feem ntau paub txog uas yog -Al₂O₃ thiab -Al₂O₃. Corundum uas muaj nyob rau hauv cov xwm belongs rau -Al₂O₃. Nws hardness yog thib ob tsuas yog pob zeb diamond. Nws muaj lub siab melting point thiab yog acid thiab alkali resistant. Nws feem ntau yog siv los ua qee cov bearings, abrasives, thiab cov ntaub ntawv refractory.
Piv txwv li, corundum crucible tuaj yeem tiv taus qhov kub thiab txias ntawm 1800 degree. Al₂O₃ tuaj nyob rau hauv ntau yam xim vim txawv impurities nws muaj. Piv txwv li, cov uas muaj cov lej ntawm Cr(III) yog liab thiab hu ua rubies; cov uas muaj Fe(II), Fe(III) los yog Ti(IV) yog hu ua sapphires.
Aluminium yog lub teeb hlau uas muaj cov cim tshuaj Al thiab atomic tooj: 13. Cov ntsiab lus ntawm txhuas nyob rau hauv lub ntiaj teb crust nyob rau hauv qeb thib peb tom qab oxygen thiab silicon. Nws yog cov khoom siv hlau ntau tshaj plaws nyob rau hauv lub ntiaj teb crust, thiab nws cov reserves thib ob ntawm cov hlau. Ntawm cov hom hlau, nws yog qhov thib ob loj tshaj plaws ntawm cov hlau tom qab hlau.