Which one of the following is a non-metallic mineral?
- A. Manganese
- B. Magnesium
- C. Gypsum
- D. Bauxite
- E. None of these
Explanation
Gypsum is hydrated calcium sulfate, a non-metallic mineral used in plaster and cement. Manganese, magnesium and aluminium-bearing bauxite are classified as metallic mineral resources.