Select the one substance that is not a mineral.

 - Aquamarine is not made by living things. It is a solid.
 - Gypsum is a solid. It is formed in nature.
 - A brick is made in a factory. 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.
Aquamarine is a mineral.
Gypsum is a mineral.
A brick is made in a factory. But all minerals are formed in nature.
So, a brick is not a mineral.