proustite

It is closely allied to, and isomorphous with, the corresponding sulfarsenide known as proustite or light red silver ore.

The mineral proustite (AgAsS) is named in his honour.

An example is relatively common mineral proustite, AgAsS.

Magnificent groups of large crystals have been found at Chañarcillo, including proustite, stephanite, chlorargyrite and adamite.

Proustite occurs in hydrothermal deposits as a phase in the oxidized and supergene zone.

Associated minerals include proustite, acanthite, native silver, tetrahedrite, galena, sphalerite and pyrite.

Minerals in the silver-ore veins include polybasite, pyrargyrite, proustite, sphalerite, galena, and tennantite.

Aguilarite occurs in association with acanthite, calcite, naumannite, pearceite, proustite, silver, stephanite, and quartz.

The streak is purplish-red, thus differing markedly from the scarlet streak of proustite and affording a ready means of distinguishing the two minerals.

It occurs in association with native silver, pyrargyrite, proustite, polybasite, stephanite, aguilarite, galena, chalcopyrite, sphalerite, calcite and quartz.

Dimorphous with pyrargyrite and proustite respectively are the rare monoclinic species pyrostilpnite or fireblende (AgSbS) and xanthoconite (AgAsS): these four minerals thus form an isodimorphous group.

Pearceite is one of the four so-called "ruby silvers", pearceite Cu(Ag,Cu)AgAsS, pyrargyrite AgSbS, proustite AgAsS and miargyrite AgSbS.

The type locality is the Mollie Gibson Mine, Aspen, Aspen District (Roaring Fork District), Pitkin County, Colorado, where the mineral occurs in hydrothermal deposits formed at low to medium temperatures, associated with acanthite, native silver, proustite, quartz, baryte and calcite.