It can be manufactured. It comes in different colors. It has a specific crystal structure. It can be melted at high temperatures.
I gave my students this multiple choice question: Which of the following is one reason that quartz is classified as a mineral?

Only one answer is correct among these 4 choices:
- It can be manufactured.
- It comes in different colors.
- It has a specific crystal structure.
- It can be melted at high temperatures.

Could you tell me which one is correct?

It has a specific crystal structure.