The mineral commonly used as a food additive is salt, which is chemically sodium chloride (NaCl).

Here's why:

* Flavor Enhancement: Salt is a primary flavor enhancer, adding a savory taste to food.

* Preservation: Salt acts as a preservative by drawing out moisture and inhibiting microbial growth.

* Texture: Salt can influence the texture of food, for example, by helping to retain moisture in meat.

While many other minerals have important roles in our diet, salt is by far the most commonly used as a food additive due to its flavoring and preservation properties.