Question

Which of the following is not a rock? a. granite b. shale c. marble d. diamond

Answer 1

Diamond is not a rock it is a mineral. 

Answer 2

Answer: Option (d) is the correct answer.

Explanation:

Diamond is composed of carbon atoms and it is the hardest mineral. It's atoms are arranged in a crystalline structure.

It is solid, bright and colorless in nature. Diamond is used to make jewelry.

Whereas granite, shale and marble are all rocks. Thus, we can conclude that out of the given options diamond is not a rock.