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Chemical formula of magnesium carbonate is MgCO3. Magnesium carbonate contain magnesium, carbon and oxygen.
The chemical formula of magnesium carbonate is Mg(CO3)2; this molecule contain one ion of magnesium and two ions of carbonate.
Magnesium carbonate is an ionic compound.
You probably think to anhydrous magnesium carbonate and hydrated magnesium carbonates:
MgCO3, MgCO3.2H2O, MgCO3.3H2O, MgCO3.5H2O
Mixture of sodium carbonate and magnesium