The mineral proustite (AgAsS) is named in his honour. Aguilarite occurs in association with acanthite, calcite, naumannite, pearceite, proustite, silver, stephanite, and quartz. Minor arsenopyrite, marcasite, chalcopyrite, valleriite, proustite, polybasite and argentite also occur. Minerals in the silver-ore veins include polybasite, pyrargyrite, proustite, sphalerite, galena, and tennantite. Associated minerals include proustite, acanthite, native silver, tetrahedrite, galena, sphalerite and pyrite. Proustite occurs in hydrothermal deposits as a phase in the oxidized and supergene zone.