Select the one substance that is not a mineral.
A: Plagioclase is not made by living things. It is a solid.
B: Glue is made in a factory. It is not a pure substance.
C: Graphite 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.
Graphite is a mineral.
Glue is not a pure substance. But all minerals are pure substances.
Glue is made in a factory. But all minerals are formed in nature.
So, glue is not a mineral.
Plagioclase is a mineral.