Choose the word which is different from the rest.

The correct answer is: Bauxite.

Feldspar, azurite, and cryolite are all minerals, while bauxite is an ore.

• Feldspar is a group of minerals that are the most abundant rock-forming minerals on Earth. They are made up of aluminum, silicon, oxygen, and potassium, sodium, or calcium. Feldspars are used in a variety of products, including glass, ceramics, and countertops.
• Azurite is a blue mineral that is a copper carbonate. It is found in copper deposits and is used as a pigment.
• Cryolite is a mineral that is a sodium aluminum fluoride. It is found in Greenland and is used in the production of aluminum.

Bauxite is an ore of aluminum. It is a mixture of aluminum oxides and hydroxides. Bauxite is the main source of aluminum metal. It is mined in Australia, Brazil, China, Guinea, India, and Jamaica.