Which of the following is the chemical formula of dolomite?
- A$KCl \cdot MgCl_2 \cdot 6H_2O$
- B$Na_3AlF_6$
- C$CaCO_3 \cdot MgCO_3$
- D$CaCl_2 \cdot MgCl_2 \cdot 2H_2O$
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