Select the one substance that is not a mineral.

 - Chalcopyrite is formed in nature. It is a pure substance.
 - Paint is not a pure substance. It is made in a factory.
 - Graphite is not made by living things. It is formed in nature.
Compare the properties of each substance to the properties of minerals. Select the substance whose properties do not match those of minerals.
Graphite is a mineral.
Paint is made in a factory. But all minerals are formed in nature.
Paint is not a pure substance. But all minerals are pure substances.
So, paint is not a mineral.
Chalcopyrite is a mineral.