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

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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.

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