minerals are inorganic. crystal structure is too hard to determine. crystal size is determined by the environment. minerals have different recognizable properties.
I gave my students this multiple choice question: Minerals can be identified using hardness, streak, and cleavage because

Only one answer is correct among these 4 choices:
- minerals are inorganic.
- crystal structure is too hard to determine.
- crystal size is determined by the environment.
- minerals have different recognizable properties.

Could you tell me which one is correct?

minerals have different recognizable properties.