Question

The mineral containing both magnesium and calcium is
1. magnesite
2. calcite
3. carnallite
4. dolomite

Answer 1

Correct Answer - Option 4 : dolomite

The correct answer is dolomite.

• The mineral containing both magnesium and calcium is Dolomite.
  
•  Dolomite is used as a source of magnesium metal and of magnesia (MgO), which is a constituent of refractory bricks.
  • Dolostone is often used instead of limestone as an aggregate for both cement and bitumen mixes and also as a flux in blast furnaces.
  • Dolomite is used as an ornamental stone, a concrete aggregate, and a source of magnesium oxide, as well as in the Pidgeon process for the production of magnesium.
  • The "dolomite problem" refers to the vast worldwide depositions of dolomite in the past geologic record eluding a unified explanation for their formation.
  • The first geologist to distinguish dolomite rock from limestone was Belsazar Hacquet in 1778.