A red-coloured form of iron ore (chemical symbol Fe2O3) that occurs in crystalline, massive or granular forms.

a mineral ore of iron (Iron Oxide, Fe2 03)

An oxide mineral of iron (Fe2O3);

the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form

Haematite is ferric oxide ore. It is a type of mineral that gives off a red colour when rubbed onto something else.