Which of the following represents the composition of Carnallite mineral?
- A$K_2O \cdot Al_2O_3 \cdot 6SiO_2$
- B$KNO_3$
- C$K_2SO_4 \cdot MgSO_4 \cdot MgCl_2 \cdot 6H_2O$
- D$KCl \cdot MgCl_2 \cdot 6H_2O$
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