The substance that will fizz when placed on a calcite mineral is dilute hydrochloric acid (HCl).

Here's why:

* Calcite is a calcium carbonate (CaCO3) mineral.

* Hydrochloric acid reacts with calcium carbonate. This reaction produces carbon dioxide gas (CO2), which is what causes the fizzing.

* The chemical equation for this reaction is:

CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)

This reaction is commonly used as a simple field test to identify calcite.