# What compound is broken down to produce the element used in cans, airplanes, and building materials?

$\text{Alumina?}$
$\text{Alumina}$ is $A {l}_{2} {O}_{3}$, and occurs naturally as the mineral $\text{corundum}$. Of course, we refine $\text{aluminum}$ from the mineral $\text{bauxite}$, which is an $\text{aluminum (III) hydroxide}$.