Select the one substance that is not a mineral.
A: Potassium feldspar is formed in nature. It is not made by living things.
B: Burlap is not a pure substance. It is made in a factory.
C: Turquoise is formed in nature. 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.
Turquoise is a mineral.
Potassium feldspar is a mineral.
Burlap is not a pure substance. But all minerals are pure substances.
Burlap is made in a factory. But all minerals are formed in nature.
So, burlap is not a mineral.