Question

Which of the following is not the mineral of iron?

Options

• Limonite

• Magnetite

• Corundum

• Haematite

Answer 1

Corundum

Explanation:

Corundum is not a mineral of iron. It is a crystalline form of aluminium oxide typically containing traces of Fe, Ti, V and Cr. Limonite, magnetite and haematite are minerals of iron.

Name and molecular formula of given minerals are given below:

Name	Mineral
Limonite	\[\ce{Fe(OH) * \text{n}H2O}\]
Magnetite	\[\ce{Fe3O4}\]
Corundum	\[\ce{Al2O3}\]
Haematite	\[\ce{Fe2O3}\]