Select the one substance that is not a mineral.
A: Muscovite is not made by living things. It is a solid.
B: Sterling silver is not a pure substance. It is a solid.
C: Native copper is not made by living things. 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.
Sterling silver is not a pure substance. But all minerals are pure substances.
So, sterling silver is not a mineral.
Muscovite is a mineral.
Native copper is a mineral.