# What is hematite made of?

Iron oxide ($F {e}_{2} {O}_{3}$)
Hematite (or haematite) is an iron oxide mineral. It is made up of a repeating lattice of iron and oxygen ions. This mineral has the chemical formula $F {e}_{2} {O}_{3}$, which is the same as that of ordinary rust. Therefore fresh samples of hematite have a rusty red appearance.