6.18 What is the role of cryolite in the metallurgy of aluminium?

Cryolite ($N{a}_{3}AI{F}_{6}$) has two roles in the metallurgy of aluminium:

1. To decrease the melting point of the mixture from 2323 K to 1140 K.

2. To increase the electrical conductivity of $A{I}_{2}{O}_{3}$