Select the one substance that is not a mineral.

 - Native gold is not made by living things. It is a pure substance.
 - Diamond is formed in nature. It is a solid.
 - Paper is made by humans. It is not 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.
Paper is made by humans. But minerals are not made by living things.
Paper is not a pure substance. But all minerals are pure substances.
So, paper is not a mineral.
Diamond is a mineral.
Native gold is a mineral.