Select the one substance that is not a mineral.
A: Hematite is a solid. It is formed in nature.
B: Fluorite is not made by living things. It is a pure substance.
C: Soap is not a pure substance. It is a solid.
Compare the properties of each substance to the properties of minerals. Select the substance whose properties do not match those of minerals.
Soap is not a pure substance. But all minerals are pure substances.
So, soap is not a mineral.
Hematite is a mineral.
Fluorite is a mineral.