Question

Which of the following is not a carbonate mineral?
1. Dolomite
2. Calcite
3. Magnesite
4. Halite

Answer 1

Correct Answer - Option 4 : Halite

Explanation

Dolomite

• Dolomite is a common rock-forming mineral and the primary constituent of sedimentary rock.
• It is Magnesium carbonate with a chemical composition as CaMg(CO3)2
• It contains brittle crystals
• It is heavier than calcite because the specific gravity of dolomite is greater than calcite, the specific gravity of dolomite and calcite is 2.85 and 2.71 respectively

 Calcite

• Calcite is a rock-forming mineral with a chemical formula of CaCO3.
• It is extremely common and found throughout the world in sedimentary, metamorphic, and igneous rocks. 
• Calcite is the principal constituent of limestone and marble

​Magnesite is (MgCO₃), it is also a carbonate.

Halite is NaCl 2H2O It's scientific name is Sodium Chloride (∴ It is not a carbonate mineral)