hardness of a mineral. structure of a mineral. cleavage of a mineral. luster of a mineral.
I gave my students this multiple choice question: A streak plate can be used to determine the

Only one answer is correct among these 4 choices:
- hardness of a mineral.
- structure of a mineral.
- cleavage of a mineral.
- luster of a mineral.

Could you tell me which one is correct?

hardness of a mineral.