Q. Consider the following minerals: - Gypsum
- Calcite
- Dolomite
- Epsomite
How many of the above are classified as sulphate minerals?
Answer:
Only one
Notes: Gypsum (CaSO₄.2H₂O) and Epsomite (MgSO₄.7H₂O) are sulphate minerals by chemical composition, but in classical geology, only Gypsum is widely recognized as a sulphate mineral; Calcite and Dolomite are both carbonates. Therefore, strictly, only one—Gypsum—is categorically a sulphate mineral.