Color is not very helpful in mineral identification because .
a. it is not a noticeable
b. property different minerals can have the same color
c. it is impossible to find the true color of mineral
d. minerals don't come in many different colors

b. property different minerals can have the same color

Explanation:

Minerals can be identified by its colour, appearance and luster. However, different minerals might have almost the same color which makes it difficult to identify and distinguish. Further tests needs to be carried out to properly identify a mineral.