Why is the salt obtained from licking stones specifically required by the ibex?

Answer

Their diet fails to provide adequate salt for nervous and muscle function

The salt obtained from geological deposits is physiologically necessary because the rest of their natural herbivorous diet does not provide enough. Insufficient salt compromises the entire nervous system and muscle function.

Why is the salt obtained from licking stones specifically required by the ibex?
animalMountainmammaladaptationIbex