Solid action: A study of physical properties in correlation with the chemistry and structure of the Ag₃AsS₃–Ag₃SbS₃ series is obtained by a combination of spectroscopic and electrochemical measurements to investigate their electrochemical reactivity in cyanide media (see figure). The difficulty to anodically dissolve the proustite?pyrargyrite series is related to the presence of AsS₃ and SbS₃ pyramidal substructures.