Select the one substance that is not a mineral.

 - Aquamarine is a solid. It is not made by living things.
 - Candle wax is made by humans. It is a solid.
 - Malachite is formed in nature. It is a pure substance.
Compare the properties of each substance to the properties of minerals. Select the substance whose properties do not match those of minerals.
Malachite is a mineral.
Candle wax is made by humans. But minerals are not made by living things.
So, candle wax is not a mineral.
Aquamarine is a mineral.