Identify the correct pair of minerals and its formula from following.

• A

  $\text { Baryte }-\mathrm{MgSO}_{4 .} .7 \mathrm{H}_2 \mathrm{O}$
• Correct answer
  B

  Cryolite $-\mathrm{Na}_3 \mathrm{AlF}_6$
• C

  Galena - Zns
• D

  Epsom salt $-\mathrm{CaSO}_4 \cdot 2 \mathrm{H}_2 \mathrm{O}$

Hence, the correct answer is option: 'B'.