Question

this mineral reacting to hydrochloric acid is

Explanation:

Minerals that react with hydrochloric acid (HCl) are often carbonates, like calcite (calcium carbonate, $\ce{CaCO_3}$). The reaction $\ce{CaCO_3 + 2HCl -> CaCl_2 + H_2O + CO_2\uparrow}$ produces bubbles ($\ce{CO_2}$ gas), which is a key test for carbonate minerals. The mineral in the image (likely calcite or a related carbonate) shows this reaction.

Answer:

Calcite (or other carbonate minerals like limestone, marble, but calcite is a common example for HCl reaction)