Select the one substance that is not a mineral.
A: Wool is made by living things. It is formed in nature.
B: Corundum is a solid. It is a pure substance.
C: Turquoise is a solid. It is not made by living things.
Compare the properties of each substance to the properties of minerals. Select the substance whose properties do not match those of minerals.
Wool is made by living things. But minerals are not made by living things.
So, wool is not a mineral.
Corundum is a mineral.
Turquoise is a mineral.