Select the one substance that is not a mineral.

 - Halite is not made by living things. It is a solid.
 - A computer processor is made in a factory. It is not a pure substance.
 - Potassium feldspar is a solid. 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.
A computer processor is made in a factory. But all minerals are formed in nature.
A computer processor is not a pure substance. But all minerals are pure substances.
So, a computer processor is not a mineral.
Halite is a mineral.
Potassium feldspar is a mineral.