Identify the correct pair of minerals and their formulas from the following.
- A$Baryte$ - $MgSO_4 \cdot 7 H_2 O$
- B$Cryolite$ - $Na_3 AlF_6$
- C$Galena$ - $ZnS$
- D$Epsom$ salt - $CaSO_4 \cdot 2 H_2 O$
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